In today’s advanced manufacturing landscape, silicone injection molding and LSR molding have emerged as critical processes for producing high-performance components across diverse industries. These advanced manufacturing techniques transform raw silicone materials into precise, durable components that meet stringent quality standards across medical, automotive, electronic, and consumer goods sectors. The global market for these services continues to expand rapidly, driven by technological advancements and increasing demand for high-precision silicone components that offer superior properties compared to conventional materials.

Liquid Silicone Rubber (LSR) represents a specialized category of silicone materials characterized by its liquid state prior to curing and exceptional material properties post-processing. Unlike traditional thermoplastic injection molding, LSR processing requires unique equipment expertise and specialized knowledge to properly handle its two-component reactive system. The global silicone injection molding market has seen consistent growth, with projections indicating continued expansion through 2031, particularly in Asian markets where manufacturing capabilities have advanced significantly . This growth trajectory underscores the increasing reliance on these specialized manufacturing processes for critical applications where material performance is non-negotiable.

2 Understanding Silicone Injection Molding Technology

2.1 The LSR Molding Process

Liquid Silicone Rubber molding operates on a fundamentally different principle than traditional thermoplastic injection molding. The process begins with a two-part platinum-cured liquid silicone system that remains liquid at room temperature but cures rapidly when heated. This process involves several critical stages: material preparation, precise metering, mixing, injection, curing, and demolding. The LSR injection molding process requires specialized equipment including refrigerated material containers, precision metering pumps, static mixers, and heated molds to properly process the material from liquid to cured rubber state.

The technology distinguishes itself through several processing advantages, including extremely fast cure times, ability to produce complex thin-walled geometries, and exceptional part consistency. Modern LSR processing equipment often incorporates advanced cold runner systems that significantly reduce material waste by maintaining the runner system at temperatures that prevent curing. These systems can be further categorized into needle-valve cold runner systems for automated high-volume production and open cold runner systems for simpler applications, each offering distinct advantages for specific production scenarios . The precision of modern LSR processing equipment allows for tight tolerances and exceptional repeatability, making it suitable for the most demanding applications.

2.2 Advantages of LSR Materials

Liquid Silicone Rubber offers numerous material advantages that explain its growing popularity across industries. These silicone material benefits include:

• Temperature Resistance: LSR maintains its properties across extreme temperature ranges, typically from -50°C to 200°C continuously, with some specialty grades withstand even higher temperatures.

• Biocompatibility: Many LSR grades meet USP Class VI, ISO 10993, and FDA standards, making them ideal for medical-grade silicone components that contact skin or bodily fluids .

• Chemical Stability: LSR demonstrates excellent resistance to chemicals, oils, solvents, and oxidation, ensuring long-term performance in demanding environments.

• Electrical Insulation: With high dielectric strength and volume resistivity, LSR provides outstanding electrical insulation properties crucial for electronic applications.

• Flexibility and Tear Resistance: LSR components offer durable flexibility with high tear resistance, even in thin cross-sections, supporting designs not possible with other materials.

The material versatility of LSR extends to its processing capabilities, particularly for multi-material molding where silicone is bonded to substrates like plastics, metals, or other silicones during the injection process . This capability enables innovative designs that combine the benefits of silicone with structural materials, expanding application possibilities across industries.

3 Global Market Landscape for Silicone Molding

The global silicone injection molding market represents a dynamic and expanding segment within the broader manufacturing industry. Current market analysis indicates sustained growth driven by increasing adoption across key sectors. According to industry research, the market is expected to continue its upward trajectory through 2031, with particularly strong performance in the medical and electronics segments . This growth pattern reflects the critical nature of silicone components in an increasingly technologically advanced product landscape.

Regional analysis reveals important geographic concentrations and emerging hotspots for LSR molding services. Currently, North America, Europe, and Asia represent the three major market regions, each with distinct characteristics and specializations. China has emerged as a particularly significant player, with its domestic LSR molding market experiencing rapid expansion and technological advancement . The presence of numerous specialized manufacturers in Guangdong province, particularly in Dongguan and Shenzhen, has created a concentrated hub for silicone manufacturing expertise . This regional specialization provides buyers with diverse options ranging from global conglomerates to highly specialized technical experts.

Application analysis reveals several key industries driving demand for silicone injection molding services:

• Medical Industry: Accounting for a significant market share, medical applications include surgical instruments, implantable devices, respiratory masks, and various diagnostic components that require medical-grade material certification .

• Automotive Sector: The transition to electric vehicles has increased demand for high-temperature resistant seals, connector seals, and battery insulation components that utilize LSR’s thermal and electrical properties.

• Electronics Industry: The miniaturization trend and need for environmental protection in consumer electronics drives adoption of LSR for waterproof seals, tactile keys, and EMI shielding components.

• Consumer Goods: From kitchen utensils to infant care products, LSR provides the safety, durability, and aesthetic qualities demanded by consumers.

This diverse application base contributes to market stability, as demand remains strong across multiple sectors despite fluctuations in individual industries.

4 Leading Global Silicone Injection Molding Companies

The international landscape for silicone injection molding companies includes several established leaders with global recognition for their technical capabilities and quality standards. These companies typically offer comprehensive services from design assistance through high-volume production, serving multinational clients across diverse industries. Based on recent market analysis and industry presence, the following table highlights prominent global players in the silicone molding sector:

Table: Leading Global Silicone Injection Molding Companies

These global silicone manufacturers have established their reputations through consistent quality, technical innovation, and reliable delivery. Companies like SIMTEC Silicone Parts have developed particular expertise in high-volume LSR injection molding, serving demanding sectors such as medical devices and automotive applications . Their capabilities often include advanced engineering support for design optimization, material selection guidance, and application-specific testing protocols to ensure component performance.

The competitive landscape features distinctive positioning strategies among these industry leaders. Some companies, including Elkem Silicones and Wacker Chemie, leverage vertical integration by manufacturing base silicone materials while also offering molding services . Others focus exclusively on manufacturing expertise, developing specialized capabilities in specific process technologies like multi-material LSR molding or micro-LSR components for miniature applications. This diversity in focus allows the market to support various business models while providing customers with multiple options based on their specific technical and commercial requirements.

5 Prominent Chinese LSR Molding Companies

China has emerged as a significant manufacturing hub for LSR molding companies, with concentrated expertise in the Guangdong province, particularly in Dongguan and Shenzhen. These Chinese manufacturers combine technical expertise with cost-effective production capabilities, serving both domestic and international markets. The following table highlights several prominent Chinese companies specializing in LSR molding:

Table: Prominent Chinese LSR Molding Companies

These Chinese LSR molding specialists have developed robust capabilities to compete in the global marketplace. Companies like Dongguan Shengying Precision have invested significantly in advanced LSR manufacturing infrastructure, including multiple LSR injection machines and precision feeding systems from German manufacturer 2KM . This level of equipment investment enables production of high-precision silicone components that meet international quality standards while offering competitive pricing structures.

The technical capabilities of Chinese LSR molders continue to advance rapidly. Companies like Shenzhen Ke’an Silicone Products highlight their expertise with complex mold designs including multi-layer molds, hot runner systems, and cold runner systems with needle valve technology . Similarly, Dongguan Jiefeng Precision emphasizes its cleanroom production facilities and extensive experience serving demanding regulated industries like medical devices and automotive electronics . These capabilities position Chinese manufacturers as viable alternatives to established global players, particularly for cost-sensitive applications requiring technical sophistication.

6 How to Select the Right Silicone Molding Companies

Selecting an appropriate silicone injection molding partner requires careful evaluation of multiple factors to ensure technical compatibility and business alignment. The decision process should balance immediate project requirements with long-term strategic considerations, as changing suppliers mid-project can involve significant cost and timeline implications. Key selection criteria include:

• Technical Capabilities: Evaluate the supplier’s expertise with your specific LSR molding process requirements, including experience with similar components, material knowledge, and technical support resources. Look for evidence of successful projects in comparable application areas and request case studies or reference contacts.

• Equipment and Infrastructure: Assess the manufacturing equipment, including  liquid silicone rubber injection molding machine specifications, automation capabilities, quality control systems, and cleanroom classifications if required for your application. Modern LSR manufacturing requires specialized equipment like precision metering systems, vacuum molding capabilities, and cold runner technologies to optimize production efficiency .

• Quality Certifications: Verify relevant quality management system certifications such as ISO 9001, ISO 13485 (for medical devices), and IATF 16949 (for automotive). Material certifications may also be critical for regulated applications, including FDA compliance, USP Class VI, or UL listings.

• Design and Engineering Support: The ideal partner provides comprehensive design for manufacturability (DFM) feedback, helping optimize part design, material selection, and manufacturing approach before tooling begins. Companies like Shenzhen Ke’an Silicone Products emphasize their mold design expertise as a key value proposition .

Beyond these technical considerations, business factors including pricing structure, production scalability, communication capabilities, and intellectual property protection should inform the selection process. The growing trend toward vertical integration may also influence partner selection, with some companies offering complementary services like mold manufacturing, material production, or secondary operations that can streamline the supply chain .

7 Future Outlook and Industry Trends

The LSR molding industry continues to evolve rapidly, driven by technological advancements and changing market demands. Several significant trends are shaping the future landscape for silicone injection molding companies:

• Advanced Material Developments: Material science innovations continue to expand LSR capabilities, with developments in specialized silicone grades including optically clear formulations, electrically conductive variants, high-thermal conductivity grades, and self-lubricating types. These advanced materials enable new applications in emerging fields like flexible electronics, energy storage, and advanced medical devices.

• Industry 4.0 Integration: The digital transformation of manufacturing is reaching LSR operations through smart manufacturing technologies including real-process monitoring, predictive maintenance systems, and data analytics for quality optimization. These technologies enable unprecedented process control and traceability, particularly important for regulated industries like medical devices.

• Sustainability Initiatives: Environmental considerations are increasingly influencing material selection and manufacturing processes, with developments in recyclable silicone compounds, energy-efficient manufacturing equipment, and processes that minimize material waste through advanced cold runner systems .

• Miniaturization Trend: The ongoing drive toward smaller components in electronics and medical devices continues to push the boundaries of micro-LSR molding capabilities, requiring increasingly precise manufacturing technologies and specialized expertise.

The market consolidation trend is also expected to continue as larger manufacturers acquire specialized technology companies to expand their service offerings and technical capabilities. This consolidation creates both opportunities and challenges for buyers, who may benefit from more comprehensive service offerings while potentially facing reduced competition in certain specialized segments. Despite this consolidation, the market continues to support specialized niche players with deep expertise in specific applications or technologies, ensuring ongoing innovation and competitive options for buyers of LSR molding services.

8 Conclusion

The landscape of silicone injection molding companies and LSR molding companies offers diverse options ranging from global material suppliers with manufacturing capabilities to specialized technical experts focusing on specific process technologies. As the market continues to expand, driven by growing adoption across medical, automotive, electronic, and consumer goods sectors, buyers have an increasingly sophisticated range of partners from which to choose.

Selection of an LSR molding partner should be guided by thorough technical evaluation, alignment of business objectives, and strategic consideration of future needs. The companies highlighted in this article represent various segments of the market, from global leaders like SIMTEC and Elkem to Chinese specialists like Dongguan Shengying Precision and Guangdong Yingtai High Precision, each offering distinct capabilities and value propositions .

As technology continues to advance, the capabilities of silicone injection molding will expand further, enabling new applications and improved performance characteristics. Companies that invest in advanced technologies, develop specialized expertise, and maintain rigorous quality standards will be best positioned to succeed in this dynamic and competitive marketplace, ultimately providing buyers with increasingly sophisticated solutions to their product development challenges.

Silicone injection molding companies are playing very important role in the modern world. There are thousand of silicone molding manufacturers and produce countless silicone products worldwide. Silicone rubber moling products are widely used in the industries like medicial device, maternal and infant health products, automotive, household, pet supplies, Sports & Outdoors industries, etc.

In recent years, silicone products` performance has been rapidly improved and increased. At the same time, the silicone molded products` manufacturing cost is going down very fast. More and more silicone products are used in people`s daily life.

On the other side, the number of silicone product manufacturer is growing as well, due to the demands of silicone products become more and more strong.

As a professor in the silicone molding industry, we will introduce the top 10 silicone injection molding companies in the world for your reference. We will list their company name, found year, offering services and brief introductions below.

It will be the right place if you are looking for custom silicone injection molding company for your project.

1. Xometry Enterprise

Founded Year: 2015
Office Location: Washington DC Metro / Maryland, USA
Business Type: plastic molding manufacturer
Top Services: Plastic Injection Molding, Custom LSR Liquid Silicone Injection Molding, Injection Molded Surface Finishes

Company Profile

Xometry delivers high-value LSR liquid silicone injection molding production from a streamlined supply chain. Our network of 10,000+ global liquid silicone rubber injection molding manufacturing partners offers nearly unlimited capacity to ensure your full production lifecycle. They manufacture custom silicone prototypes and end-use production parts in 15 days or less in a range of durometers and grades of LSR materials. Whether you’re validating a new prototype or preparing to shift into full LSR injection molding production runs, Xometry is prepared to accelerate your growth.

2. WAYKEN RAPID MANUFACTURING LIMITED

Founded Year:
Office Location: 2002
Business Type: Rapid Prototyping Designs and Manufacturing Manufacturer
Top Services: Silicone Injection Molding, Custom Silicone Products and Parts Molding,

Company Profile

Founded in Shenzhen, China, WayKen is a prototyping company and rapid manufacturer specializing in rapid prototyping and low-volume manufacturing of plastic and metal parts, providing a one-stop-shop from prototype to production.

With advanced manufacturing technology and a highly skilled team, WayKen has always maintained an excellent competitive advantage. We custom our manufacturing services to meet your specific product design needs, including CNC machining, 3D printing, vacuum casting, rapid tooling, plastics and liquid silicone injection molding.

3. LEAD TECHNOLOGY GROUP Limited

Founded Year: 2006
Office Location: Shenzhen, China
Business Type: Rapid Prototyping Designs and Manufacturing Manufacturer
Top Services: Silicone Injection Molding, Custom Silicone Products and Parts Molding, Plastic and Metal Moldings

Company Profile

LEADRP is a Shenzhen based silicone rapid prototyping and manufacturing service company. LEADRP is your “One-Stop Shop” for prototyping, tooling and manufacturing. LEADRP offers rapid prototyping, tooling and low volume manufacturing services to help companies bring their product ideas to reality! We specialize in producing highly complex precision silicone products and parts manufacturing, as well as CNC machining, sheet metal fabrication, injection molding, urethane vacuum casting, 3D printing, and post processing. There’s no limit to what we can create!

4. TDL Mould

Founded Year: 1995
Office Location: Dongguan, China
Business Type: Precision Mold Maker & Injection Molding Manufacturer
Top Services: Silicone Injection Molding, Plastic Injection Molding, Custom Mold Design, Overmolding, Multi-Cavity Mold Manufacturing

Company Profile

TDL Mould is a professional mold manufacturer and custom injection molding supplier based in Dongguan, China. Equipped with advanced machining centers and precision EDM systems, TDL delivers high-quality silicone molds and molded parts with tight tolerances and smooth surface finishes. The company’s engineering team excels in optimizing mold design for Liquid Silicone Rubber (LSR) and thermoplastic materials, helping customers achieve better part quality, faster cycle time, and reduced manufacturing costs.

If you are looking for a reliable silicone injection molding partner, TDL Mould provides full technical support from DFM analysis to mass production.

5. STOCKWELL ELASTOMERICS

Founded Year: 1919
Office Location: 4749 Tolbut Street, Philadelphia, PA 19136
Business Type: Designs and Manufacturing Manufacturer
Top Services: Silicone Injection Molding, Custom Silicone Products and Parts Molding,

Company Profile

Injection molding of liquid silicone rubber (LSR) is the fastest growing segment of Stockwell Elastomerics’ molding operations. Liquid silicone rubber (LSR) is a family of materials commonly specified for gaskets, seals and cushioning pads in portable communications, data acquisition devices, sensing instruments and rugged enclosures with demanding sealing requirements in outdoor conditions. Stockwell Elastomerics’ press cured liquid silicone rubber uses platinum cure systems, also called addition cure, that does not generate organic acid during curing like peroxide catalyzed silicones. LSR is also sulfur free and plasticizer free; this has made it friendly to many electronics assemblies that were formerly required to be “silicone free”.

6. SIMTEC

Founded Year: 2002
Office Location: 9658 Premier Pkwy, Miramar, FL 33025, United States
Business Type: Designs and Manufacturing Manufacturer
Top Services: Silicone Injection Molding, Custom Silicone Products and Parts Molding,

Company Profile

SIMTEC is a research and technology-driven custom manufacturer of Liquid Silicone Rubber (LSR), LSR overmolded, and LSR Multi-Shot (LSR/Thermoplastics/metal substrate) parts and components. Since our company’s inception in 2002, we have been continuously developing extraordinary Liquid Silicone Rubber injection molding solutions for industry-leading OEM corporations around the globe.

With services ranging from design support, pre-production prototypes and pilot runs, to high precision, large-scale Liquid Silicone Rubber parts and components production, our goal is to remain a top Liquid Silicone Rubber injection molding company and a business partner you can rely on to consistently provide superior service and innovative, high quality LSR injection molded solutions.

7. J – CAD International

Founded Year: 2006
Office Location: 55 Scollard Street, Toronto, Ontario, Canada M5R0A1
Business Type: Designs and Manufacturing Manufacturer
Top Services: Silicone Injection Molding, Custom Silicone Products and Parts Molding, Silicone Mold and Tool Building

Company Profile

J – CAD Inc. opened for business in 2006 and since then has been helping clients globally with 3D CAD Design Services, Prototyping, 3D Printed parts, Plastic and Silicone Mold Making, Welding, Machining, Fabrication & Mass Production!

J – CAD Inc. has been involved in the 3D Printing and Rapid Prototyping Industry since it’s beginning and for this reason we are highly experienced in knowing what can and cannot be done. There are virtually no limitations to 3D printing but with J – CAD Inc’s experience in the plastic molding and LSR silicone rubber injection molding industry, we can guide and help you determine the best method to achieve what you’re looking to do.

8. Nolato

Founded Year: 1938
Office Location: Swedish
Business Type: Designs and Manufacturing Manufacturer
Top Services: Silicone Injection Molding, Custom Silicone Products and Parts Molding,

Company Profile

Nolato is a Swedish publicly listed group with operations in Europe, Asia and North America. Its three business areas develop and manufacture products in polymer materials such as plastic, silicone and TPE for leading, often global, companies.

Silicone injection molding offers exciting design and molding opportunities. Nolato can help you take advantage of LSR’s design flexibility, and our advanced silicone molding technologies can cut your program costs and increase component quality.

9. Extreme Molding

Founded Year: 2002
Office Location: 339 Broadway, Menands, NY 12204 USA
Business Type: Designs and Manufacturing Manufacturer
Top Services: Custom Silicone Products and Parts Molding, Silicone Injection Molding,Packaging & Fulfillment,Overmolding, Color Matching, Compression and Transfer Molding

Company Profile

Extreme Molding is the top choice for high-end consumer and life science products made from high-performance silicones. From our home just outside of Albany, NY, we partner with both small and large businesses throughout the United States, Canada and Europe.

Extreme Molding has the technical capabilities to handle any complex silicone molding application. Over the years we have developed expertise in the markets of non-regulated healthcare products (specifically for women and infants), specialty consumer/light industrial products, pet supplies, and medical components.

One of the most unique aspects about Extreme Molding is our full-service production model. Our model saves our clients time, money, and warehouse space. We mold your silicone products and take care of any post-production operations, such as assembly, packaging, and fulfillment.

10. Trelleborg

Founded Year: 1986
Office Location: Continental AG, Germany
Business Type: Silicone Medical Device and Parts Molding Manufacturer
Top Services: Plastic Injection Molding, Custom LSR Liquid Silicone Injection Molding, Injection Molded Surface Finishes

Company Profile

Trelleborg is committed to supporting the healthcare and medical industry with advanced polymer engineered components.
Already a leading developer and manufacturer of sealing solutions for the healthcare and medical applications, Trelleborg has recently made significant investments in advanced technology to expand its offerings to its customers.

During 2011, Trelleborg Healthcare & Medical acquired a Swiss-based company with expertise in Liquid Silicone Rubber (LSR) technology and in particular automation of the process to enable manufacture of precision LSR components in high volume.

Guangzhou Guanxin Machinery

Founded Year: 2002
Office Location: Guangzhou, China
Business Type: Silicone Molding Machinery Manufacturer
Top Machines : Silicone Injection Molding Machines, Custom Silicone Molding Machinery, Liquid Silicone Processing Equipment

Company Profile

Guanxin Machinery is a unique plastics and liquid silicone injection molding machinery manufacturer established in Guangzhou in 1999. As a professional injection molding machine manufacturer, we have become a leader in the plastic and liquid silicone injection molding industry.

The founders and current managers Dr. Deng and Alvin Chen have brought more than 20 years of injection molding machine production, operation and business sales experience to Guanxin Machinery, including metal raw materials, mechanical structure design, hydraulic oil circuits, electrical control, domestic sales and international trade knowledge and technologies. They are also passionate about exceptional customer service and have built a culture that blends technical expertise and innovation with responsiveness, transparency and a desire to turn every customer into a true partner.

You are warm welcome to contact us with detailed or brief project requirements. We will try our best to help you in the business to have a win-win situation for lifetime strategy partners and friends.

LSR is favored by medical, baby care and automotive applications for its unique properties (the upper left and right pictures include diving mask parts, automotive parts and baby pacifiers injection molded with LSR, and the lower right picture is a syringe injection molded with LSR sealing parts)

Although injection molded liquid silicone rubber (LSR) is not a new product, its applications in medical, automotive, baby care and general industrial fields have maintained a rapid growth momentum in recent years. As a thermosetting resin, LSR provides properties that currently cannot be provided by TPE. LSR’s impressive properties include heat resistance, excellent low-temperature flexibility, chemical resistance, biological inertness, and inherent lubricity. Due to the increasing popularity of soft/hard overmolding technology, many thermoplastic processors are looking to LSR injection molding as a way to expand their business. Fortunately, the processing of LSR has many similarities to the processing of thermoplastics. For all their differences, many thermoplastic processors have been able to successfully transition to processing LSR with appropriate attention and learning.

What is Liquid Silicone Rubber LSR?

The basic raw material of silicone rubber is sand or silica (SiO2). The sand is first processed into pure metallic silicon, which is then reacted with methyl chloride, through a series of steps that can form silicone in a variety of forms, from liquids and polymers to rubber-based compounds. Unlike most plastics, silicone has a backbone of alternating silicon and carbon atoms, with organic side chains that give the material cross-linkability and other properties. Because of this, LSR not only has some processing properties consistent with thermoplastic plastics, but also has some inherent characteristics of thermosetting plastics.

LSR uses a platinum catalyst for cross-linking with no by-products. Once cross-linked, LSR cannot be reprocessed or easily recycled and reused because of the high energy required to overcome the cross-links and break the backbone. LSR’s identical molecular structure enables its use over a wide temperature range. At the same time, the strong bonding force between silicon and oxygen atoms makes the degradation temperature of LSR much higher than other polymers. Some of LSR’s other attributes are chemical inertness and purity, which combined with its ability to withstand high-temperature sterilization make it an ideal material for many medical applications as well as baby care products.

LSR usually contains two components with different viscosities, which need to be added to the static mixer in a 1:1 ratio before being fed into the barrel of the liquid silicone injection molding machine.

Click Picture To Check Our LSR Molding Machine and Material Feeding System

Working principle of LSR injection molding process

After introducing the excellent characteristics of LSR, it is also necessary to introduce the similarities and differences between the processing of LSR and thermoplastics. First of all, LSR injection molding equipment looks very similar to thermoplastic injection molding machines. They both have a feeding system to fill the resin into the barrel of the injection molding machine, and then inject the resin in the barrel into the mold for molding. However, one of the biggest differences occurs inside the mold. Thermoplastics must be heated in the barrel to change from a solid to a molten state, and then cooled back to a solid state in the mold. LSR is just the opposite. Its initial state is fluid and is then heated in the mold for cross-linking and solidification. The barrel of the injection molding machine adopts a water cooling device to keep the temperature below the solidification point of LSR. The mold is usually heated to 180~200℃. Molds for thermoplastics can minimize nozzle and sprue materials by using hot runners, while LSR uses cold runners to keep the material cool until it enters the mold cavity. Since LSR is a high-value material that cannot be reused, waste reduction is even more important than with thermoplastics.

The method of adding LSR to the barrel is different from thermoplastics. LSR is a paste, similar to peanut butter, and usually consists of two components, of which component A contains a cross-linking agent and component B contains a catalyst. The two components can promote the curing reaction of LSR after being mixed. After the two components A and B are pumped into the barrel at a ratio of 1:1, they can be injected after being fully mixed. Usually this requires entering a water-cooled mixer to complete the mixing of the material before entering the injection unit. Most LSR injection molding machines also use an injection screw to achieve further mixing.

Compared with thermoplastics, LSR has a very low viscosity in hot molds, so moldmakers need to pay extra attention to the parting line and vents when making molds to prevent flashing of the product. This characteristic of LSR also has advantages, that is, it is easy to form very long and thin products.

The thermoplastic must fill the mold to ensure the integrity of the product’s shape. To do this, holding pressure must be applied so that additional material can be filled into the mold cavity as the product shrinks. However, this step is not required for molded LSR. Since LSR cross-linking itself will expand, pressure-maintaining and filling will definitely cause excessive expansion of the product during mold opening, resulting in uncontrollable size of the product. Silicone rubber also shrinks through cooling, but its shrinkage rate is uniform. For these reasons, when molding silicone rubber, only one pressure is required if the mold design has taken into account LSR expansion and contraction.

The injection molding process of LSR should be viewed as consisting of 4 parts. The type and grade of LSR material is only one important component; the quality of the injection molding machine, pumping unit and mold also play an important role. For the injection molding production of LSR products, through the use of reasonable design and technology, automated production like the processing of thermoplastic plastics can also be achieved.

Diversity of Liquid Silicone Rubber LSR

Like thermoplastics, LSR comes in many varieties and grades. According to the touch and hardness, it can be divided into two types: “wet” (similar to rubber) and “dry” (smooth). General-purpose LSR is not filled with too much filler (typical filler is silica) and is suitable for general physical properties. Through the addition of additives and other fillers, LSR can withstand high temperatures or environments with oils and other liquids. The addition of phenyl group improves the low-temperature performance of LSR. Adding phenyl fluid can reduce the friction coefficient of the material and make the surface of the product smoother. There are also some LSRs that have a low coefficient of friction themselves and do not require the use of liquid to lubricate their surfaces.

For many processors and product designers, the use of self-adhesive grade LSR that enables soft/hard overmolding (also known as two-component or 2K molding) is of great significance. These new materials can be bonded to thermoplastics without the need for additional bonding steps.

This not only eliminates the bonding operation, but also enables in-mold bonding of LSR to thermoplastics because the curing time is close to the cooling time of the thermoplastic. This process is similar to soft/hard overmolding of thermoplastics. The difference is that the mold on the Liquid Silicone Rubber LSR side needs to be heated to cross-link and cure the LSR, so its heat resistance should be considered when selecting the thermoplastic substrate material (it will not be affected by the deformation due to the influence of curing temperature). In some applications, waste heat from solidification of the thermoplastic can be used to cure LSR.

The self-adhesive properties of LSR to a variety of thermoplastics can bring advantages to product design. LSR can be precisely placed in an area of a product that requires a special function without covering the entire surface of the product with functional material. Likewise, portions of the thermoplastic substrate material not clad with LSR do not need to be thickened to withstand LSR curing temperatures. For processors, this not only reduces material costs, but also allows products to become smaller to cater to the trend of product miniaturization.

It should be pointed out that the initial bonding strength of the current self-adhesive LSR technology is designed so that no damage occurs when the product is demoulded (no one wants LSR to adhere to the metal of the mold). Over two weeks, the bond strength will continue to increase and will generally reach its best level before being sent to the end user. If the processor wants to reach the maximum bonding strength faster, the product can be baked in a high-temperature oven at 100°C for 1 hour.

How to solve the problem about silicone injeciton molding mold sticking?

In liquid silicone injection molding, the mould adheres to the product, often known as the mould sticking, or the demoulding is particularly difficult and requires the use of a release agent and other physical means to help demoulding. This LSR silicone injection molding process will lead directly to low production efficiency of liquid silicone injection molding, damaging equipment and products. The silicone injection molding process quality also affects a lot on the final quality silicone products. Silicone products are stretched and deformed, and physical means are used to remove the silicone particles when they stick the mould, causing the mold to damage and damage, etc. The silicone injeciton mold lifespan will be shorten if it needs mold maintanence often.

The original traditional method:

cleaning and sticking the mold or removing it with potion, and using potion or brush to remove the flash on the parting surface.

However, for transparent products at that time, the mold was polished to a mirror surface, and the traditional function was to scrub it bit by bit with cotton pads. , and a professional polishing master is required, otherwise the mold will be directly disassembled, and the flash on the parting surface can only be picked out bit by bit with a toothpick. The efficiency can be imagined, even if it is ordinary silicone The efficiency of product cleaning with chemicals is also low, generally taking about 30 minutes.

The use of a new fluorine nano-coating process can effectively reduce the occurrence of mold sticking:

Coating features: anti-fingerprint, stain-resistant, easy to clean, smooth, release, wear-resistant

Uncoated mold: It is difficult to take off during molding, cannot be taken off, and is easy to get stuck. The product scrap rate is high due to mucous membrane, erosion, and corrosion during the die-casting process. Or during stamping and forming processing, the mold is often damaged due to wear. , sticking, bite, fatigue fracture and other factors lead to low production efficiency.

Coated mold: easy to clean, smooth, good release property, completely solves the problem of mucous membrane in the die-casting process in hydrophobic and oleophobic state, does not get stuck, and improves production yield rate.

For the touch: rubber mold, liquid silicone mold, self-adhesive silicone, the mold is made of stainless steel.

Processing process: The processing speed is fast and the efficiency is high. The full coating process can be completed within 1-3 days.

Food-grade liquid silicone rubber is a kind of addition-type two-component silica gel, divided into component A and component B. Component A is silica gel, and component B contains platinum catalyst. The entire addition-type two-component liquid silica gel is composed of platinum catalyst, 107 base gum, white carbon black and hydrogen-containing silicone oil. Among them, platinum catalyst is a very important component element. Only with the blessing of platinum catalyst can the two components AB be well solidified and formed.

What is sludge? Sludge is an indispensable auxiliary material in the application and production of silicone molds. Commonly used sludge materials mainly include the following types. One is 60% industrial clay (talcum powder), 30% flexible binder (grease or butter), and 10% solid binder (paraffin or petroleum jelly). The second type is wax 9% to 10%, sulfur 50% to 55%, ash 9% to 10%, grease (butter) 20% to 25%, and a little resin and pigment. The third type is construction sludge, which consists of clay and tung oil.

Sludge is mainly used for handicrafts, hardware, plastic mold making, and student sculptures. It can be recycled and will not deteriorate after being stored for a long time. It is characterized by being sensitive to temperature and can be softened and shaped at low temperatures. The sculptures of handicrafts and other models are extremely malleable.

So can the additive food-grade environmentally friendly silicone come into contact with the sludge? It depends on whether the components of the sludge contain heavy metals and other toxic impurities, that is, whether the sludge can pass food environmental certification. If the sludge contains heavy metals and toxic impurities, once the addition-type silicone comes into contact with the sludge, the contact surface between the food-grade liquid silicone rubber and the sludge will not solidify. The reason is that the platinum in the addition-type food-grade liquid silicone

The gold catalyst is a very active component with extremely strong chemical sensitivity. Once the platinum catalyst comes into contact with toxic substances in the sludge, it will cause the platinum catalyst in the silica gel to fail, thus directly affecting the solidification and molding of the addition food-grade liquid silica gel. .

Advantages of food-grade silicone materials

In many industries, the importance of material selection makes the difference in product quality and performance. Speaking of food-grade silicone material, it has occupied many fields and is widely used in many industries. But many people don’t know what are the advantages of food-grade silica gel compared with other silica gel products? Today Hongtu will analyze the advantages of food-grade silica gel for you.

One of the most important auxiliary materials for food-grade liquid silicone rubber raw materials is silica raw materials, which must first be guaranteed in terms of quality. Many silicone rubber product manufacturers require corresponding test reports before selecting and purchasing raw materials, and whether they will receive corresponding requirements. Silica is one of the most important materials in solid silicone, and its quality determines the performance of the material. Its heat resistance, temperature resistance, tensile strength, etc. are better than ordinary silica, so it is a high-performance material in high-temperature vulcanized silicone rubber and can meet the requirements of food grade, high transparency, and high stretchability.

Fumed silica gel is the heated food grade silica gel product of choice. It plays a major role in silica gel raw materials, because the silicon chain is fine and flexible, the product has high purity, improved hand feel, improved tensile life, and the normal service life is more than twice that of the ordinary precipitation method. Many food-grade silicone products in the market can meet FDA, ROHS and other test certifications and are environmentally friendly and non-toxic.

In the processing process of food-grade liquid silicone rubber product manufacturers, gas phase silicone has certain advantages in the processing and production process. It has strong plasticity and can be mixed more carefully during the rubber refining process. Adding toner and vulcanizing agent can make other The excipients melt more easily and keep the color bright to improve viscosity and fluidity.

Among the raw materials for silicone rubber products, fumed silica is an indispensable reinforcing material in silicone rubber. Due to its unique properties, it has gradually occupied many fields and is widely used in medical, daily necessities, cosmetics, skin care products and other industries.

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How to identify food grade silica gel

1. Distinguish from the smell of silicone products

Ordinary silicone smells pungent and has a strong smell. Food-grade silicone is non-toxic and odorless. It has no smell and is an environmentally friendly silicone.

2. Judging from the high temperature resistance of silicone products

Food-grade silicone’s high temperature resistance is generally 250 degrees, and its short-term high temperature resistance can reach about 350 degrees. However, ordinary silicone can only reach a maximum of about 150 degrees.

3. Judging from the stretch degree of silicone

Let’s take a silicone sheet of the same hardness as an example. Take a silicone sheet and stretch it with your hands, and pull it hard with both hands. If it turns white when you pull it and you can smell a pungent smell, it means it is ordinary silicone. On the contrary It is food-grade silicone that does not turn white when pulled and has good stretchability. Sometimes it won’t turn white when pulled. Because the manufacturer produces by-products during the vulcanization process, there will be a light smell. However, it is also food-grade silicone, which will not affect the product quality, and this smell can be eliminated by itself. of.

From the above food-grade silica gel identification methods, we can know that food-grade silica gel generally passes FDA food-grade certification, is non-toxic and tasteless, and has the characteristics of high temperature resistance, high tensile strength, and tear resistance.

Food-grade liquid silicone rubber has a wide range of application fields: it is generally used in the medical industry, electronics industry, baby products, aerospace and aviation industry, automobile industry and some daily necessities, etc. Some common products such as silicone baby pacifiers and silicone tableware are widely used

Food-grade silicone in silicone molds: can be used for automobile parts, military material parts, aerospace material molds, resin handicraft molds, car tire molds, yacht molds, chocolate molds, cake molds, etc.

food-grade liquid silicone rubber in terms of silicone products: can be used to make silicone prostheses, silicone chest patches, silicone masks, silicone dolls, silicone gaskets, adult products, simulated food, simulated dishes, medical-grade products, etc.

Food grade silicone maintenance tips

1. After each use of the silicone mold, you should clean it with hot water (diluted edible detergent) or put it in the dishwasher. Do not use abrasive detergents or foam to clean it. Make sure that the silicone gel is used and stored after each use. It’s all dry before.

2. When baking, the silicone molds should be placed flat on the baking sheet separately. Never dry bake the mold, such as a 6-piece mold. If you only need 3 molds, the other 3 molds must also be filled with water. Otherwise, the mold will be damaged and the service life of the mold will be reduced. In order to ensure that the finished product can achieve a good baking effect, you can lightly spray a small amount of anti-stick baking pan oil on the silicone surface of the mold before baking.

3. When baking is completed, please remove the entire baking tray from the oven and place the baked product on a cooling rack until it cools completely.

4. Silica gel can only be used in ovens, ovens, and microwave ovens. It is strictly prohibited to use gas, open flames, or electricity, or use it directly above the heating plate or below the barbecue.

5. Please do not use knives or other sharp objects on silicone products, and avoid heavy pressure and pulling.

6. Due to static electricity, silicone molds are prone to dust. If not used for a long time, they should be placed in a carton away from direct sunlight.

7. Please do not rinse the silicone mold with cold water immediately after it comes out of the oven to extend its service life.

Things to use when using food silicone raw materials:

1. When using, food-grade silicone raw materials must be fully exposed to the air. The larger the contact area, the faster the curing. On the contrary, the curing will be slower or even non-curing. The thicker the adhesive layer, the longer the vulcanization time. The greater the humidity and the higher the temperature in the same environment, the faster the curing speed of the adhesive layer. The opposite is true.

2. This food-grade silicone raw material product is a non-dangerous chemical and can be stored and transported as non-dangerous goods. When used, it does not cause poison or pollution to the human body and the environment, so there is no need to take too many preventive measures.

3. Products should be kept dry and protected from sunlight and rain during storage and transportation. The effective storage period is 12 months. If it exceeds the storage period, it can still be used after passing the inspection. After using the product, the hose should be tightly capped immediately and can be kept for reuse.

4. First clean the components to be glued to remove oil stains on the surface, then squeeze out the product from the silicone raw material hose and apply it on the surface of the components. When the glue comes into contact with the moisture in the air, it begins to flow from the surface. and gradually solidifies into an elastomer.

What is the mark of food grade silicone?

Generally, food-grade liquid silicone has relevant certificates such as RoSH, SGS, Reach, and MSDS to confirm its safety.

How to identify the quality of food grade silica gel

First of all, look at the appearance. The food-grade silicone liquid made of new and good materials is transparent and bright, and the colloid is also very delicate. The phenomenon shown is that the liquid silicone gel has very good fluidity and is very smooth. The color of liquid silica gel produced from waste rubber cracked materials is yellow and opaque, and the silicone oil layer in the glue is not evenly separated. Poor liquid silicone has obvious lumps and impurities when stirred, and its fluidity is poor.

The second is the smell. Really good food-grade silicone has no smell, is environmentally friendly, non-toxic and tasteless. The liquid silicone produced from cracked materials uses inferior silicone oil and base rubber. This poor material has a certain smell and cannot be completely environmentally friendly, non-toxic and tasteless.

The last step is to look at the effect after curing. After the liquid silicone made from imported raw materials is cured, the surface is very dry and there is no oil or stickiness. After the silicone made from ordinary cracked silicone is cured, especially zero-degree liquid silicone is particularly prone to leakage. Oily and sticky.

Analysis of the reasons why food-grade silicone materials do not solidify

One characteristic of addition-type food-grade silica gel is that when it comes into contact with non-environmentally friendly materials such as sulfur, tin, lead amine, etc., it will be poisoned and will not solidify. The liquid silica gel will form into lumps or solidify. The back surface becomes sticky or cannot be cured at all, resulting in production waste. Therefore, contact with sulfur-containing lead-tinamine substances must be avoided during production, including mixing equipment, containers, etc.

The second reason for non-curing: The AB component must be fully stirred evenly. If not stirred evenly, the glue will not solidify, or the curing will be incomplete, similar to sticky hands.

The third reason: AB component is not added according to the proportion. If component A or component B is added more or less, it will also cause incomplete curing of silicone. Regarding the incomplete curing of addition-type food-grade liquid silicone, The common ones are mainly the above points, and there are many more that you still need to explore slowly by yourself during production.

What are the testing standards for food-grade silica gel?

In terms of performance testing of food-grade silicone addition liquid silicone, it is mainly judged based on the following parameters, including hardness, viscosity, tear strength, tensile strength and elongation. The hardness of food-grade liquid silicone ranges from Shore A0 to 60 degrees, with units every 5 degrees in between. The viscosity of addition-type food-grade silicone is generally below 10,000 cps. As the hardness of the silicone becomes higher, its viscosity will also increase.

Other properties such as tear resistance also change with the change of hardness parameters. The general rule is that the higher the hardness, the worse the performance of silica gel will be; anyway, the lower the hardness, the worse the performance of silica gel will be. The hardness is in the range of 20-30 degrees, and the performance strength of addition-type silicone is the most suitable.

In terms of environmental performance testing of additive food-grade liquid silicone rubber, there are many standards and different methods. First of all, you need to check whether the additive food-grade silicone has a pungent smell. If there is a pungent smell, it is industrial-grade liquid silicone. Secondly, look at the ratio of silica gel. The ratio of addition-type silica gel is mostly 1:1 or 10:1, while the ratio of industrial-grade silica gel is mostly 100:2. The last step is to check whether the addition-type silica gel is prone to poisoning reactions. The main reason is that food-grade silica gel comes into contact with toxic and harmful elements such as heavy metals, which will cause the addition-type liquid silica gel to be poisoned and not solidify.

How to reduce bubbles in food-grade liquid silicone without a vacuum machine?

When food-grade liquid silicone is mixed and stirred, air is mixed into the liquid silicone during the mixing process due to the contact between the liquid silicone and the air, thereby forming bubbles. Too many bubbles will make the molded silicone mold look ugly, and the molded product will also have many pores. Under normal circumstances, we will use a vacuum machine to remove air bubbles, but in the absence of a vacuum machine, how to remove air bubbles from food-grade liquid silicone without a vacuum machine?

If there are only a few bubbles on the surface, it is because the bubbles brought in when the silica gel and curing agent are mixed are not completely eliminated, so when we stir, we need to stir clockwise along the wall of the container. When pouring, we can The liquid silicone flows slowly downward in a filamentous shape, so that the bubbles can be eliminated while pouring the glue. After filling, the bubbles on the surface can be popped with a toothpick.

Food-grade silicone can withstand high temperatures. When encountering a large number of bubbles, we can use a slightly higher temperature to bake the curing agent of the liquid silicone to eliminate impurities, reduce the bubbles, and then use a hair dryer or air gun to blow away the bubbles; of course Also pay attention to whether the mold is for food, such as chocolate molds. You can use an air gun to blow away surface bubbles.

We can also extend the curing time by controlling the ratio of silica gel to curing agent and buy time for the bubbles to naturally discharge. For example, the weight ratio of food-grade silica gel to catalyst is 1:1. We can slightly reduce the catalyst and the two components. The cross-linking reaction is quick-frozen, so that the bubbles in the liquid food-grade silica gel will be slowly discharged upward to reduce the bubbles; you can also negotiate with the food-grade liquid silica gel manufacturer during the ordering process to adjust the operating time to control the elimination of bubbles.

The above-mentioned methods of using toothpicks or sharp air to pop bubbles, or using a hair dryer or air gun to disperse bubbles can only eliminate a little of the bubbles on the surface of food-grade silicone, but it does not ensure that the entire silicone product is bubble-free. If you want to remove the bubbles cleanly, you must use vacuum to remove the bubbles.

Can liquid silicone be disinfected with water? How long is appropriate for disinfection?

Silicone itself is very stable. If it has passed the food grade, it will not change easily. However, you should pay attention to the use environment and try not to use high temperatures above 250 degrees for baking. Food-grade silicone materials have a variety of unique properties. In addition to In addition to high temperature resistance, it can also fully adapt to low temperature environments and climate. In terms of stability, the main components of silicone material are silica, silicone resin and white carbon black. In addition to the catalyst added by the silicone product manufacturer (sulfide agent) will not conflict with any substance, and the catalyst smell can be removed through secondary fluidization and high-temperature baking.

Liquid silicone is an extremely easy-to-clean material and does not require the use of chemicals such as detergent. Furthermore, silicone has good waterproof properties. In addition to pure silicone products, many are made of multi-material metal-plastic composite materials, so it is recommended that the boiling and disinfection time be between 5-15 minutes is more suitable. In addition to boiling in boiling water, the silicone products produced by regular mold silicone manufacturers can also be used in the microwave oven, which is very convenient. However, you must also be careful not to buy fake and shoddy products, otherwise it will be very dangerous. May cause harm to the body.

Generally speaking, regular liquid silicone rubber products can be boiled in boiling water, which can disinfect and sterilize without producing any toxic substances. Food-grade silicone is often formed using liquid silicone after solidification, and its high temperature resistance range is – Between 60℃-230℃, therefore, it can be suitable for direct disinfection by boiling in water.

Application trends of food-grade liquid silicone rubber

According to the report published by Virtue Market Research in 2022, the Global Food Grade Silicone Rubber Market was valued at $976.9 million, and is projected to reach a market size of $1389.25 million by 2030. Over the forecast period of 2023-2030, market is projected to grow at a CAGR of 5.5% .

The global food grade silicone rubber market size was USD 670.78 Million in 2022 and is expected to register a revenue CAGR of 6% over the forecast period, reaching $1.13 billion by 2032.

Food-grade liquid silicone products use the LSR injection molding process (also called liquid silicone injection molding). The two-component or multi-component liquid silicone mixed fluid is pressurized and injected into the heated mold through an injection molding feeder. After curing and molding, it is Production can be completed. Compared with other production processes, the liquid silicone injection molding process has good automation and no waste of raw materials. The injection molded rubber can be fully automated and does not require too much human participation. It can also control manufacturing costs and raw materials.

Food-grade liquid silicone rubber products are also very economical and practical in daily life. Liquid silicone has good tear and wear resistance, and can also be anti-fall and shock-proof. It can be a good substitute for our commonly used fragile items. In addition, liquid silicone products are also soft and skin-friendly, and can well come into contact with human skin without causing adverse reactions. Liquid silicone products also have excellent chemical inertness and can be exposed to a variety of foods and substances without causing changes and material reaction.

According to statistics, the procurement and application volume of liquid silicone in 2018 reached more than 1.6 million tons. The penetration rate of liquid silicone application in various industries will reach more than 40% in 2021. Food-grade liquid silicone will usher in explosive growth in various industries. The food-grade liquid silicone molding process mainly covers consumer electronics such as mobile phones, smart wearables, handheld terminals, connectors, automobiles, medical fields, etc., especially the field of smart terminals will be a new generation of 3-proof process innovation.

Food-grade silicone products are widely used in mechanical products such as coffee pots, water heaters, bread machines, disinfection cabinets, water dispensers, kettles, irons, rice cookers, fryers, pulp machines, and burning appliances. Machinery, electrical appliances, electrical and other industries. Such as: protective covers for water dispensers, coffee pots, beauty salon equipment and lighting products; as well as food replicas, chocolate molds, candy molds, infant comfort toys, food cake molds, various food mats, baby bibs, silicone ice Grids, silicone pacifiers, etc.

Features of food-grade liquid silicone rubberproducts:

High temperature resistance: applicable temperature range -40 to 230 degrees Celsius, can be used in microwave ovens and ovens.

Easy to clean: Silicone products produced from liquid silicone can be cleaned by rinsing with water after use, and can also be cleaned in the dishwasher.

Long life: The chemical properties of silicone materials are very stable, and the products produced have a longer life than other materials.

Soft and comfortable: Thanks to the softness of silicone material, cake mold products are comfortable to touch, relatively flexible, and do not deform.

Various colors: Different beautiful colors can be blended according to customer needs.

Environmentally friendly and non-toxic: No toxic or harmful substances are produced from raw materials entering the factory to finished product shipments.

Insulating properties: Silicone rubber has a high resistivity and its resistance remains stable over a wide temperature range and frequency range. At the same time, silica gel has good resistance to high-voltage corona discharge and arc discharge, such as high-voltage insulators, TV high-voltage caps, electrical components, etc.

Low temperature resistance: The critical point of ordinary rubber’s operating temperature is -20 degrees to -30 degrees. However, silicone rubber still has good elasticity at -60 degrees to -70 degrees. Some specially formulated silicone rubbers can also withstand higher temperatures. Low temperature, such as low temperature sealing rings, etc.

Conductivity: When conductive fillers (such as carbon black) are added, silicone rubber has good conductive properties, such as keyboard conductive contact points, electric heating element components, antistatic components, high-voltage cable shielding, medical therapy conductive film, etc.

Weather resistance: Ordinary rubber degrades rapidly under the action of ozone generated by corona discharge, while silicone rubber is not affected by ozone, and its physical properties only change slightly when exposed to ultraviolet rays and other climate conditions for a long time, such as those used outdoors. Sealing materials, etc.

Thermal conductivity: When certain thermal conductive fillers are added, silicone rubber has good thermal conductivity, such as heat sinks, thermal seals, copy machines, fax machine thermal rollers, etc.

What are the common problems in using food-grade silicone products?

1. Food-grade liquid silicone rubber tableware

Silicone tableware is easy to use, non-toxic and odorless, and does not release harmful substances. More importantly, it can withstand high-temperature boiling without deformation or wear. However, there are also problems that need to be paid attention to when using silicone tableware:

Foods containing high amounts of acid or grease cannot be served with silicone tableware, because silica gel will react chemically with acid and grease, causing the silica gel to decompose and affecting food safety. Therefore, silicone tableware is best used only to hold harmless foods such as rice and noodles.

When using silicone tableware, be careful to avoid small particles of food, such as rice grains, minced meat, animal bones, etc., because these things will scratch small cracks on the surface of the silicone and affect the performance and safety of the silicone.

Food-grade liquid silicone rubber tableware cannot be heated in the oven or microwave, otherwise it will deform and melt due to excessive temperature.

Food-grade liquid silicone rubber tableware should be cleaned regularly, preferably with warm water and neutral detergent. Scratching tools such as brushes should not be used to prevent the silicone surface from being scratched and affecting safety.

2. Food-grade liquid silicone rubber baking pan

Silicone bakeware is a common product among silicone products. It is not only suitable for baking cakes, bread and other baked goods, but is also widely used in microwave ovens, steam ovens, etc.

Before baking, a layer of cooking oil must be applied to the surface of the silicone baking pan to ensure smooth demoulding of cakes, bread and other foods. But be careful not to apply too much oil, otherwise it will affect the quality and taste of the food.

The griddle can be heated in the oven, but the maximum temperature must not exceed 450℉ and it cannot be used over an open flame or on the grill. In addition, the baking pan should not be exposed to the sun to avoid losing its high temperature resistance, weather resistance and other properties due to excessive exposure.

When heating the silicone baking pan in the microwave, you must check the baking pan for damage and cracks and replace it as soon as possible if necessary. In addition, the time in the microwave oven should not be too long, try to control it within 3 minutes.

3. Food-grade liquid silicone rubber injection mold

Food-grade liquid silicone injection molds are mainly used to make candies, chocolates, cakes and other foods. Because silica gel has good flexibility and is non-toxic and tasteless, it is very popular in the food manufacturing industry. However, there are some issues that need attention during use:

Before using the silicone mold, be sure to clean it with clean water, and then apply a thin layer of oil on the surface to prevent the food from sticking inside. But be careful not to apply too much, so as not to affect the taste of the food.

During use, be careful not to scratch the surface of the mold. If there are scratches on the surface, it will easily absorb stains and make it difficult to clean. Therefore, when using silicone molds, you should use kitchen utensils such as stainless steel shovels that will not scratch the surface of the mold.

Silicone molds cannot be exposed to open flames and high-temperature environments, and they must not be exposed to sunlight to avoid losing elasticity, cracking, and becoming sticky due to high-temperature burning and excessive exposure.

4. food-grade liquid silicone rubber coasters

Food-grade liquid silicone coasters are a kind of tableware used to place cups, water cups, glasses, etc., which not only protect the tabletop, but also prevent the cups from sliding and making them less likely to fall over. However, there are also issues that need to be paid attention to when using silicone coasters:

Food-grade liquid silicone rubber coasters can be cleaned with mild detergent and warm water, and can be temporarily placed on the cleaning table to dry after use. But be careful not to wash it in the dishwasher or use bleach, so as not to affect the quality and life of the silicone.

When using food-grade liquid silicone coasters, avoid dropping the cup heavily on the mat, as this will shorten the service life of the silicone. It is also not advisable to let leaking water from the cup spill onto the silicone coaster to avoid gelatinization and damage to the silicone.

Food-grade liquid silicone rubber coasters should be stored in a cool place in the kitchen to avoid prolonged exposure to sunlight. At the same time, be careful not to stack them during storage to avoid leaving obvious marks and affecting the quality.

The performance requirements of human body-specific silicone raw materials are higher than those of general mold silicone raw materials or pad printing glues. It needs to be specially prepared, so the output is relatively small; the most important thing is that there is less demand from customers.

What is the performance of human-like silicone materials? How long is the service life?

Human body silicone rubber manufacturer’s imitation human body silicone is a kind of addition type silicone rubbes. It is a low viscosity 1:1 series A and B two-component silicone. The overall hardness is relatively low, about 0 to 15 degrees. If the hardness is too high, it will broken away from the category of human-like silicone. It is used to make artificial human masks, headgear, artificial human models, and adult products. The mixing viscosity is around 1000-3000cps. The operation method is manual, which is similar to the operation method of silicone for ordinary molds.

As for its service life, it can be divided into storage life in liquid form and service life of the finished product after curing.

Human body-like silicone is specially produced through a special process. It has special properties of high temperature resistance, aging resistance, acid and alkali resistance. The uncured two-component body-simulating silicone A and B will never solidify without mixing, and will always remain in a liquid state. Just as time goes by, the water inside the liquid silicone gradually evaporates, and the remaining silicone components will precipitate, and the overall viscosity of the silicone will become thicker. At this time, you only need to add some silicone oil and stir quickly, and it will become very thin. Can be operated multiple times for long-term storage. Generally, additive liquid silicone and human-like silicone need to be kept in a cool place away from direct sunlight. Generally, the longest shelf life is about 12 months.

The liquid form human-like silicone materials service life is about one year. Then how long is the shelf life of cured silicone products?

In fact, cured silicone products can be left without any change for 5-10 years under normal use and proper maintenance. Although it can withstand high temperatures, the biggest fear is using it at high temperatures. If the cured human-like silicone is baked at high temperature for a long time, the color will turn yellow, the hardness will become hard, and the performance will deteriorate. The molecular structure inside the silicone will be destroyed, the performance will decrease, and the use value may be very short.

Precautions:
Liquid human body silicone should be stored in a sealed manner, and the mixed human body silicone should be used up at one time within the specified time to avoid waste caused by solidification of the rubber;

* Avoid contact between rubber and materials containing nitrogen (N), phosphorus (P), sulfur (S), tin (Sn), lead (Pb), mercury (Hg), alcohols, water, etc., such as organotin compounds and organic compounds containing Tin silicone rubber sulfur, sulfide, sulfur-containing rubber, ammonia compounds and ammonia-containing materials cannot come into contact with containers or molds that have been adjusted for condensation rubber. Otherwise, the surface of the addition liquid silicone rubber will become sticky, Incomplete curing or even no curing.

* When operating, it must be distinguished from containers that have been used in condensation silica gel. Use unused room temperature silica gel tools to operate this silica gel to avoid non-curing or sticky surface, signs of incomplete curing or even non-curing. At the same time, avoid Such as contact with sludge, various types of clay, putty, and solder.

What are the applications of human body-like silicone raw materials?

1. Physical dolls, needless to say, they are called human silicone because they are made of physical dolls.

2. Suture practice modules are used for medical practice. The effect is definitely the closer to human skin, the better. They must be environmentally friendly, so human body silicone can be used to make suture practice modules.

3. The aircraft cup has basically the same requirements as the physical doll, so it can be made of human body silicone.

4. Silicone breast prostheses are definitely needed for environmental protection, softness, and close to human touch. Human silicone is the most suitable.

5. The robot skin must have strong tear resistance and a certain degree of self-healing properties. Human body silicone is very suitable.

6. Silicone film and television masks have very good simulation effects and are environmentally friendly. They can be made from human body silicone.

7. Human prosthetics are just like physical dolls…

8. Artificial dildo. In fact, the hardness needs to be adjusted when using human silicone to make an artificial dildo. Everyone knows the reason, but the hardness of human silicone can be adjusted. So it fits.

9. Toy balls for venting are environmentally friendly and safer because they are often in contact with hands. They can be made of human body silicone.

10. Other products with similar requirements can be made of human body silicone.

Human body silicone has a wide range of applications, and the physical dolls produced are becoming more and more recognized by the public. The emergence of intelligent robots will create greater demand for human body silicone.

What is Silicone Toe Protectors Making Machine

The silicone toe protectors making machine have three main slicone molding equipment, they are silicone injection molding machine and liquid silicone rubber metering and dosing machine. And there is a watter chiller is required to keep the liquid silicone do not cured before injected into the mold. The silicone injection molding machine is optimized with the injeciton unit which ensure 2 components liquid silicon and the colorants is mixed completely even. And with shut-off nozzle to avoid the liquid silicone leaking from the nozzle. As the nozzle mostly will leave the silicone injection mold after compressor hold. Then the liquid silicone rubber metering and dosing machine ensure A and B component silicone is mixed with a precise ratio of 1:1. This is very important as it affects a lot on the silicone toe protectors quality.

Foot care product silicone toe protector injection mold is another important part for the silicone toe protectors making production line. It is the key for foot care product silicone toe protectors manufacturing as it is depends what kind of toe protector we will produced.

Main Process of Silicone Toe Manufacturing

1.Define what exactly toe protector it is.

We should firstly find and get how the toe protector looks like and the purpose it`s used for. And then work out the shape and size details. And we should make it good for human engineering. Then we will have to build the 3D model with computer. Now many company will make it a few samples with 3D printing for using test in their inner designing terms. And then keep it up to date for their used experience. Then gain a final designed product to start mass production to launch in the market.

2: Open injection mold for the toe protectors:

To manufacture silicone toe protectors, a precise mold is needed to produce the final product’s shape and size. The LSR silicone injection mold, is normally made by steel or aluminum. Just ensures the accuracy can meet the requirement and good for mass production like 24 hours non-stop automatic manufacturing. And the silicone injection molding tooling is with cold to hot runner designed.

3: Silicone Material Preparation:

The next step is find out what kind of liquid silicone rubber (LSR) will be best for the toe pretctor of foot care product. It should be in the right hardness and right color. And try to find out the silicone raw material supplier for your production.

4: Injection Molding Process:

LSR silicone injection molding machines are very important in the silicone toe protector manufacturing process. These silicone injection machines is mostly dedicated design comparing to the traditional injection molding machines. Especially for the mixing and injection molding screw. Silicone injection molding will need an silicone feeding system which mix two type of material together with strictly scale about 1:1. The feeding system should be precise design to produce high performance products. 2 sets of liquid silicone rubber is pump to a joint and mixed even, and then to the screw and barrel of the LSR injection molding machine. In this area screw will mix the material again and compress the LSR with a setting pressure. Then it`s injected to the silicone injection mold which mention above step 2.

5: Curing and Cooling:

Once the silicone material is injected into the mold, then it will goes to the curing process. The material is exposed to heat, which triggers a cross-linking reaction, solidifying it and shaping it according to the mold cavity. Carefully controlled curing time and temperature ensure proper curing without compromising the material’s properties.

Simultaneously, the mold is cooled to expedite the curing process and enhance production efficiency. Cooling methods vary and may involve water circulation or air cooling. After curing and cooling, the mold is opened, and the newly formed silicone toe protectors are extracted.

6: Quality Control and Finishing:

We will need to have quality checking after the toe protectors produced by LSR silicone molding machine. Just ensure they meet the designs required standards. The quality control may include but not only with shape deforms, appearance, hardness, with air bubbles or not, etc.

Once the foot care product toe protectors pass quality control, they will go to finishing processes. The finishing process will be sorting, labeling and packing. Then it will be transfer to the warehouse to get ready for sales.

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