Are you looking for the best rubber injection molding factories in China? If so, you’re in the right place. In this article, we’ll compare the top players in the industry, highlighting their strengths, specialties, and what sets them apart. From Qingdao Weilian to Xiamen Better Silicon Rubber, let’s dive into the world of Chinese rubber injection molding.

Top 10 Rubber Injection Molding Companies and Suppliers in …

Product Details: Hongju specializes in manufacturing Liquid Silicone Rubber (LSR) products using advanced injection molding technology. The products include intricate medical components, keypads, O-ring seals, gaskets, rubber feet, and rubber grommets. The company can handle minimum to medium quantity orders, rapid prototyping, and custom designs. The LSR injection molding process allows for the production of highly complex designs with minimal waste and high repeatability. The capabilities include producing parts up to 12 in. x 8 in. x 4 in. (304.88mm x 203.2mm x 101.6mm) in size and a maximum depth of 2 in. (50.88 mm) from parting lines[1].

Pros:
– High-precision production of complex designs
– Minimal waste due to the injection molding process
– High repeatability and consistency
– Short production lead times and competitive market rates
– 24/7 customer support by expert engineers
– Rapid prototyping and handling of custom designs
– ISO 9001:2015 certified and compliance with CE and FDA standards
– Environmentally friendly materials and processes

Cons:
– Limited size and depth capabilities (e.g., maximum size of 12 in. x 8 in. x 4 in…
– Production cycle can vary according to quantity and complexity of products

Rubber Molding | Rubber Extrusion | Liquid Silicone Extrusion …

Product Details: Rubber extrusion and molding involve processes to create rubber parts and components. Rubber extrusion produces two-dimensional parts with continuous lengths by pushing unvulcanized rubber through a die, shaping it into the desired profile. Rubber molding, including compression, injection, and transfer molding, creates three-dimensional shapes using heat and pressure. Common materials include Buna, Nitrile, Neoprene, Viton, EPDM, Silicone, and Hypalon. These processes cater to various applications such as sealing, noise control, vibration, and decorative trim across industries like automotive, construction, and industrial manufacturing[2][3][5].

Pros:
– High efficiency and precision, especially in injection molding for high-volume p…
– Ability to create complex shapes and profiles with tight tolerances
– Versatility in material selection to meet specific application requirements
– Continuous lengths in extrusion minimize assembly needs and enhance structural i…
– Cost-competitive solutions with short lead times

Cons:
– Compression molding can be slower and less efficient for high-volume runs
– Transfer molding may require additional steps for bonding with metal components
– Specific temperature and pressure requirements can limit the types of rubber mat…
– Post-processing steps like cutting, drilling, and vulcanization may add complexi…

Rubber Injection Molding Services

Product Details: Richfields Corporation offers rubber injection molding services, specializing in materials such as TPE (Thermoplastic Elastomers) and TPV (Thermoplastic Vulcanizates). The company provides custom and standard molded rubber parts for various applications, including consumer, FDA, and industrial uses. Their services include assistance from engineering and production teams to resolve tooling and production concerns. Richfields operates in China, offering production flexibility and cost-efficient solutions.

Pros:
– Expertise in TPE and TPV materials
– Production flexibility and cost efficiency
– Assistance from engineering and production teams
– Ability to supply parts for consumer, FDA, and industrial applications

Cons:
– No specific cons mentioned on the website
– Potential language or cultural barriers for international clients

Custom Rubber Injection Molding Service

Product Details: LSR injection molding involves creating custom silicone parts using a high-temperature tool made via CNC machining. The process uses an LSR-specific injection molding press to ensure precise control over shot size. Materials include standard silicones and specific grades for various applications. LSR parts are thermosetting, meaning their molded state is permanent. The service includes options for single, multi-cavity, and family molds, with various press tonnages and side actions. Tolerances are typically +/- 0.005″ when machining the mold and +/- 0.002″ per inch for shrink rate. Inspection and certification options include FAI, PPAP, and various ISO standards[1][3].

Pros:
– Offers great UV and ozone resistance and outstanding electrical insulation
– Suitable for a range of industries including medical, lighting, and automotive
– Can produce parts with a wide range of durometers (10 to 80 Shore A)
– Provides endless options for materials, finishes, tolerances, markings, and cert…
– Ensures consistent properties through rigorous testing and quality control

Cons:
– LSR is more challenging to work with compared to thermoplastics due to its physi…
– Higher tooling costs may be incurred for tighter tolerances and critical feature…
– The process requires specialized equipment and expertise

injection molding rubber in china

Product Details: Injection molding in China involves the production of parts from thermoplastic, thermosetting plastic materials, and silicone materials. The process includes feeding these materials into a heated tube, mixing, and then forcing them into a mold cavity where they cool and harden. The materials used include natural rubber from latex trees, synthetic thermoplastic rubber, and silicone for liquid injection molding (LIM). This technique is used for various products such as medical parts, automotive parts, and mechanical tools. The molds are made from materials like steel and aluminum, and precision-made molds are used for medical and other precise applications.

Pros:
– Allows for the production of identical parts, which is crucial for maintenance a…
– Can create complex and precise parts, such as medical tools and equipment, and b…
– Supports the use of various materials, including natural rubber, synthetic therm…
– Ensures high consistency and quality in the produced parts.

Cons:
– The process involves several complex steps, including material collection, coagu…
– The initial investment in injection molding tools is expensive due to the need f…
– The use of certain materials, like natural rubber, depends on geographical avail…

Rubber Molding Product

Product Details: Manufacturing Group (China) Limited produces a variety of high-quality and affordable rubber molding products. These products are utilized across multiple industries, including aerospace, automotive, construction, consumer and commercial goods, food processing, general industrial, and medical. Common components include seals, gaskets, electrical enclosure weather seals, architectural and window seals, fiberoptic sheathes, outdoor electrical enclosures, scratchproof feet for appliances, oven and kitchen equipment seals, backflow preventers, bellows, elastomeric check valves, electrical connectors seals, ordinance seals, and water purification and filtration seals[5].

Pros:
– Precision and durability of custom rubber molded products
– Elimination of most labor saves time and cost and adds machine-driven consistenc…
– Machine-driven processing of the raw material allows for faster production times
– Injection molding can be more cost-effective
– Compression and Transfer molding have advantages

Cons:
– No specific cons mentioned in the provided sources.

Custom Rubber Mould Manufacturer Injection …

Liquid Silicone Rubber China LSR injection molding

Product Details: Liquid Silicone Rubber (LSR) injection molding is a process to produce pliable, durable, and precise silicone rubber parts. It involves mixing two compounds (base-forming silicone and platinum catalyst) at room temperature, which are then pumped into a hot mold and heat-cured. LSR is known for its low compression set, good stability, and resistance to extreme temperatures (-60°F to 400°F). The material is supplied in Part A and Part B components, mixed in a 1:1 ratio, and can be pigmented and additized during the mixing process. LSR is used in various applications such as seals, sealing membranes, electric connectors, infant products,

and kitchen goods.

Pros:
– High-volume production with consistent part quality
– Fast cure cycles (30 seconds to 2 minutes) compared to compression molding
– Reduced tooling costs and lead times due to fewer cavities needed
– Ability to fill very thin cross sections, tight radii, and thick/thin features w…
– Excellent temperature resistance and chemical stability
– Low viscosity ensures minimal flash development and reduced post-molding trimmin…
– Environmentally friendly with minimal waste production

Cons:
– Custom colors may require additional hardware, potentially exceeding $3500
– LSR is a thermosetting polymer, meaning it cannot be melted and reformed like th…
– Tooling design and fabrication require high-temperature resistance and specific…
– Higher initial tooling costs for high-precision molds
– Potential for increased cost if tighter tolerances or complex designs are requir…

Silicone Rubber Transfer Injection Molding

Product Details: Rubber Transfer Molding, also known as Transfer-injection Moulding, is a process that uses a hydraulic press to mold rubber components. It is ideal for over-molded (metal, plastic) components, tighter control of dimensional tolerance, and medium-precision or complicated structure rubber components such as nozzles, thin bellows, or tubing. The process involves placing preformed raw material into a pot between the top plate and a plunger. When the mold closes, the plunger compresses the material and transfers it through sprues into the cavities[5].

Pros:
– Tighter control of dimensional tolerance
– Suitable for producing complex shapes and higher volumes of rubber products
– Minimizes material waste and reduces the need for post-production trimming
– Ideal for over-molded (metal, plastic) components and cylinder-shaped products
– Achieves higher precision and more detailed parts compared to other methods like…

Cons:
– More complex and requires more machinery compared to compression molding
– Can result in more waste as the rubber remaining after transfer will cure and ha…
– Requires secondary raw material preparation into pre-forms[3][4][5]

Injection Molding China

Comparison Table

Frequently Asked Questions (FAQs)

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

In Chinese rubber molding factories, you’ll commonly find three main processes: compression molding, transfer molding, and injection molding. Compression molding involves compressing pre-heated material into a mold, which is great for low to medium production volumes. Transfer molding uses a piston to force material into the mold cavity, ideal for more complex products. Injection molding is the most precise and cost-effective for high-volume production, especially for small, intricate parts.

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

The lead time for producing a rubber mold in China can vary. For prototype tooling and samples, you can expect around 7 days. For production molds, it usually takes about 14 days. Some factories also offer fast mold design services, where they can provide a design for manufacture (DFM) within 24 hours after receiving your drawings.

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

Injection molding for rubber parts offers several benefits. It ensures consistent quality, tight tolerances, and faster production times. This process is particularly cost-effective for high-volume production and is suitable for all rubber durometers. It’s ideal for smaller, intricate products where precision is crucial.

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

When choosing a reliable rubber injection molding company in China, look for companies with extensive experience, good customer support, and relevant certifications like ISO 9001 and ISO 14001. Check if they have worked with international clients and have a diverse product range. Also, consider their production capabilities, such as the type of equipment they use and their ability to handle different materials.

What kind of materials can Chinese rubber molding factories work with?

Chinese rubber molding factories can work with a wide range of materials, including various types of silicone rubber, natural rubber, and synthetic rubbers. They can handle different durometers and materials suitable for various applications, such as medical devices, automotive parts, and industrial components. Some factories also specialize in working with specific materials like medical-grade and food-grade silicone.