Are you looking for the best rubber injection molding factories in China? With so many options available, choosing the right one can be overwhelming. In this article, we’ll compare the top rubber injection molding companies in China, highlighting their strengths, specialties, and what sets them apart. Let’s dive in and find the perfect fit for your needs.

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Liquid Silicone Rubber China LSR injection molding

Product Details: Liquid Silicone Rubber (LSR) injection molding is a process to produce pliable, durable parts in high volume. LSR is a high-purity platinum-cured silicone with low compression set, good stability, and the ability to resist extreme temperatures of heat and cold. It is suitable for producing parts such as seals, sealing membranes, electric connectors, and infant products. The process involves mixing two compounds (base-forming silicone and platinum catalyst) in a 1:1 ratio, which are then injected into a heated mold cavity and cured. LSR materials range from 10 to 80 durometer Shore A and are known for their hydrophobic properties, making

them suitable for electrical surface insulation.

Pros:
– High-volume production with consistent part quality
– Improved performance properties, retaining flexibility and elasticity from -60°F…
– Fast cure cycles, typically between 30 seconds to 2 minutes
– Reduced tooling costs and lead times due to fewer cavities needed
– Minimal waste production and environmentally friendly
– Excellent UV and ozone resistance, and good chemical resistance
– High tear and tensile strength, and excellent flexibility

Cons:
– Custom colors may require additional hardware, potentially exceeding $3500
– LSR is a thermosetting polymer, meaning it cannot be melted and reformed like th…
– Specialized tooling and equipment are required to handle the high-temperature an…
– Higher initial tooling costs for high-temperature resistant molds

injection molding rubber in china

Product Details: Injection molding rubber in China involves the production of parts from various materials, including natural rubber, synthetic thermoplastic rubber, and silicone materials. Natural rubber is derived from latex trees, primarily in countries like Thailand and Vietnam, and undergoes a process of tapping, coagulation, and calendaring before being dried and processed. Silicone rubber is used in liquid injection molding (LIM), which is activated by mixing with agents and then heated or vulcanized. This process is crucial for producing precise rubber parts, especially in medical, automotive, and mechanical tools. The injection molding process involves feeding materials into a heated tube, mixing, and

then forcing them into a mold cavity where they cool and harden. Precision-made molds, often made from steel or aluminum, are used to ensure consistent and high-quality products.

Pros:
– Allows for the production of precise and consistent rubber parts, which is essen…
– Enables the creation of replacement parts that are identical to the originals, f…
– Suitable for producing a wide range of products, including medical tools, auto p…
– The use of advanced materials like silicone rubber in LIM ensures high-quality a…

Cons:
– The process of natural rubber production involves labor-intensive steps such as…
– The requirement for specialized molds and equipment can be expensive, especially…

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LSR Injection Moulding from China manufacturer

Product Details: Liquid Silicone Rubber (LSR) injection molding involves mixing a two-component compound, which is then heat-cured in a mold with a platinum catalyst. The process uses high-temperature tools fabricated via CNC machining. LSR is a thermosetting material, meaning it is cured by heat to cross-link polymer chains. It is popular in medical, automotive, and other industries due to its good physical properties, including high temperature resistance, UV and ozone resistance, and electrical insulation. LSR parts can range from 10 to 80 durometer Shore A and are known for their flexibility and durability.

Pros:
– High temperature resistance (-110°C to +350°C)
– UV and ozone resistance
– Electrical insulation
– Flexible and durable
– Suitable for medical, automotive, and various other applications
– Low chance of contamination due to automated processes
– Quick cycle time and minimal material waste

Cons:
– Requires high-temperature tooling, which can be costly
– Tooling process can be lengthy and requires significant capital investment
– Limited to thermosetting properties, meaning the molded state is permanent and c…
– May require additional equipment for handling and secondary processes

Silicone Rubber Transfer Injection Molding

Product Details: Silicone transfer molding is a manufacturing technique that combines elements of injection and compression molding. It involves loading a two-component silicone rubber into a transfer pot, which is then pushed into a mold cavity under heat and pressure. This process is ideal for producing medium-volume, high-quality parts with intricate details and tight tolerances. The silicone material, such as High Consistency Rubber (HCR) or Liquid Silicone Rubber (LSR), is mixed with a curing agent and any necessary fillers or additives before being transferred into the mold. The curing process transforms the silicone into its final form, providing structural integrity and desired

physical properties.

Pros:
– Ensures accurate replication of the mold design with high precision and detail
– Suitable for producing complex shapes and parts with tight tolerances
– Minimizes material waste and reduces the need for post-production trimming
– Allows for flexible production runs and short cycle times
– Ideal for applications requiring high levels of precision, such as medical devic…

Cons:
– Limited to production runs of up to 10,000-20,000 units due to mold and press cy…
– Requires separate premixing or milling of the base silicone rubber, cure catalys…
– Can result in waste of excess silicone that cures and must be discarded after tr…
– May require additional cleaning and preparation steps when using inserts

Silicone Injection Molding from China manufacturer

Product Details: Liquid Silicone Rubber (LSR) injection molding is a thermoset process used to produce high volumes of pliable, durable, and precise silicone rubber parts. The process involves mixing two compounds (base-forming silicone and a platinum catalyst) which are then injected into a heated mold and cured through heat. The resulting parts are flexible and have permanent molded states. LSR molding is suitable for various industries including medical, lighting, and automotive. It offers a range of durometers (10 to 80 Shore A) and can be produced with different finishes and certifications such as ISO 9001, AS9100, and ISO 13485.

Pros:
– High UV and ozone resistance
– Outstanding electrical insulation
– Suitable for high-volume production with consistent quality
– Environmentally friendly with minimal waste
– Precise and intricate part design capabilities
– Automated processing reduces human error
– Safer and more precise compared to rubber compression molding

Cons:
– Higher initial tooling costs due to the need for high-temperature tools
– Tighter tolerances may increase the cost of tooling
– The process requires specialized equipment and machines
– Material cannot be melted and reused like thermoplastics

Comparison Table

Frequently Asked Questions (FAQs)

Frequently Asked Questions About Injection Moulding Rubber Factories in China

What are the main types of rubber moulding processes used in Chinese factories?

Chinese rubber moulding factories primarily use three types of processes: compression moulding, transfer moulding, and injection moulding. Compression moulding is great for low to medium production volumes and larger parts, while transfer moulding is ideal for more complex products with tighter tolerances. Injection moulding is the most cost-effective for high-volume production of small, precise parts.

How long does it typically take to produce a rubber mould in China?

The lead time for producing a rubber mould in China can vary. For prototype tooling and samples, it usually takes around 7 days. For production moulds, it typically takes about 14 days. Some factories also offer fast mould design services, such as Design For Manufacturability (DFM) within 24 hours after receiving your drawings.

What are the benefits of using injection moulding for rubber parts?

Injection moulding offers several benefits, including consistent and precise production, tight tolerances, and faster production times. It is particularly cost-effective for high-volume production of small to medium-sized rubber parts. This method also ensures better control over pressure, temperature, and material flow, resulting in high-quality products.

How do I choose a reliable rubber injection moulding company in China?

When choosing a reliable rubber injection moulding company in China, consider factors such as the company’s experience, customer service, and certifications like ISO 9001. Look for companies with a strong track record of delivering high-quality products and good customer support. Also, check if they have worked with clients similar to you and if they offer additional services like mould design and post-processing.

What kind of materials can be used in rubber injection moulding in Chinese factories?

Chinese rubber injection moulding factories can work with a wide range of rubber materials, including all rubber durometers and medical-grade silicone. They can handle various types of silicone rubber, such as liquid silicone for injection overmoulding, and other materials like millable silicone. This versatility allows for the production of diverse products, from seals and gaskets to medical devices and automotive parts.