Rubber Injection Molding

Custom Rubber Injection Molding Services

Our custom rubber injection molding services excel in providing precise, tailor-made solutions for a multitude of applications. Utilizing state-of-the-art machinery and expertise, we offer a wide range of specialized rubber components to meet your unique requirements.

Our process begins with meticulous mold design and fabrication, ensuring the exact shape and dimensions you need. This precision extends to the injection phase, where we introduce molten rubber materials into the molds with unmatched accuracy. As a result, you receive components with tight tolerances and consistent quality, suitable for industries demanding perfection, such as automotive, medical, and aerospace.

  • Diverse Rubber Compounds
  • Sustainable Manufacturing
  • Efficient, Precise, On-time
Rubber Injection Molding -

What’s Rubber Injection Molding Process?

The Rubber Molding Process produces a diverse range of rubber components. The rubber molding process is typically chosen for applications where tight tolerances, high volume, and speed are in demand. This intricate process involves several meticulous stages, transforming raw rubber strips into solid rubber components under high heat and pressure.

Initially, raw rubber strips are entered into the screw chamber via a hopper, where it is heated and compressed. As a result, the rubber turns into a molten state. Then, this liquid rubber is injected into a meticulously crafted mold to mirror the desired end product’s exact shape, texture, and intricacies. The final rubber parts undergo rigorous quality assessments.

Our Qualification For Rubber Injection Molding Service

At JIAHUI, we boast robust qualifications that underpin our excellence in rubber injection molding. Our proficiency in this specialized field is exemplified by our meticulous process, which ensures the highest quality rubber components.

Our team comprises extensively trained engineers and technicians with in-depth expertise in rubber injection molding. They carefully oversee every process step, from mold design and fabrication to the actual injection of rubber materials. This attention to detail guarantees that each component meets your specifications and tolerances.

We pride ourselves on our state-of-the-art machinery at the forefront of rubber injection molding technology. Our equipment enables us to achieve unparalleled precision and consistency in every product we manufacture. This cutting-edge technology, combined with our skilled workforce, ensures efficient production and reduces lead times, helping you stay on schedule and within budget.

Manufacturing Process

Our rubber injection molding process starts with the careful design and fabrication of molds to exact specifications. We then precisely inject molten rubber material into these molds under controlled conditions. This ensures intricate geometries and tight tolerances in the final products. Our advanced machinery and skilled technicians work in tandem to guarantee efficiency and consistency throughout the production cycle.

Material Weight Size Limit Hardness Tolerance
NR 0.003~5kg 300mm x 300mm x 50mm Shore 20-90A ±0.1mm~0.3mm
SBR 0.003~5kg 300mm x 300mm x 50mm Shore 40-90A ±0.1mm~0.3mm
BR 0.003~5kg 300mm x 300mm x 50mm Shore 30-90A ±0.1mm~0.3mm
PUR 0.003~5kg 300mm x 300mm x 50mm Shore 60-90A ±0.1mm~0.3mm
CR 0.003~5kg 300mm x 300mm x 50mm Shore 20-80A ±0.1mm~0.3mm
NBR 0.003~5kg 300mm x 300mm x 50mm Shore 30-90A ±0.1mm~0.3mm
Silicone(Q) 0.003~3kg 200mm x 150mm x 50mm Shore 20-80A ±0.1mm~0.3mm
FPM 0.003~5kg 300mm x 300mm x 50mm Shore 60-90A ±0.1mm~0.3mm

Our Rubber Injection Molding Production Capabilities

Our rubber injection molding production capabilities are second to none. With cutting-edge machinery and a highly skilled team, we can handle projects of varying complexities. Whether you need small, intricate components or larger, robust parts, we have the capacity and expertise to deliver precisely what you require. Trust us for efficient, high-quality rubber injection molding solutions.

Materials for Rubber Injection Molding Parts

Our range of materials for rubber injection molding is extensive, encompassing options such as silicone, EPDM, and natural rubber. These versatile options allow us to meet diverse environmental and functional demands with precision and quality.

  • NR
  • SBR
  • BR
  • PUR
  • CR
  • NBR
  • HTV


NR (Natural Rubber) is a highly elastic and resilient material derived from the sap of rubber trees. It offers excellent tear strength, abrasion resistance, and is commonly used in applications such as tires, seals, and conveyor belts.


  • High elasticity and resilience
  • Good tear strength
  • Excellent abrasion resistance
  • Natural electrical insulation properties
  • Limited resistance to oils, solvents, and chemicals



SBR is a synthetic rubber made from the copolymerization of styrene and butadiene. It is known for its excellent wear resistance, good aging stability, and has a wide range of applications in the automotive, construction and industrial fields.


  • Good abrasion resistance
  • High tensile strength
  • Excellent flexibility
  • Resistant to aging and weathering
  • Wide range of temperature tolerance



BR (Butadiene Rubber) is a synthetic rubber derived from the polymerization of butadiene. It possesses high elasticity, excellent tear strength, good resistance to abrasion, and is commonly used in the production of tires, footwear, adhesives, and various industrial applications.


  • High elasticity and flexibility
  • Good tear and abrasion resistance
  • Excellent low-temperature performance
  • Strong adhesion properties
  • Resistant to oils, solvents, and chemicals.



PUR (Polyurethane) is a versatile polymer material formed by the reaction of isocyanates with polyols. It exhibits exceptional durability, flexibility, and resilience. PUR is widely used in various industries for applications such as insulation, cushioning, coatings, adhesives, and automotive components.


  • Excellent durability and resilience
  • High flexibility and elasticity
  • Good resistance to abrasion and impact
  • Superior insulation properties
  • Wide range of chemical compatibility



CR (Chloroprene Rubber), also known as Neoprene, is a synthetic rubber material derived from the polymerization of chloroprene monomers. It possesses excellent resistance to weathering, ozone, oil, and chemicals. CR is widely used in applications requiring resistance to harsh environments, such as automotive, construction, and marine industries.


  • Excellent resistance to weathering, ozone, and UV radiation
  • High resistance to oils, solvents, and chemicals
  • Good flame resistance and self-extinguishing properties
  • Superior flexibility and elasticity over a wide temperature range
  • Excellent physical properties, including tear strength and abrasion resistance



NBR (Nitrile Butadiene Rubber), also known as Buna-N, is a synthetic rubber material derived from the copolymerization of butadiene and acrylonitrile monomers. It exhibits excellent resistance to oils, fuels, and chemicals, making it widely used in industries such as automotive, oil and gas, and industrial manufacturing.


  • Excellent resistance to oils, fuels, and chemicals
  • High tensile strength and tear resistance
  • Good flexibility and elasticity over a wide temperature range
  • Low permeability to gases and liquids
  • Resistant to abrasion and wear, making it suitable for sealing applications



High-temperature vulcanized Silicone Rubber (HTV) is a type of rubber material that undergoes a vulcanization process at high temperatures. It is known for its excellent heat resistance, electrical insulation properties, and flexibility. HTV is commonly used in automotive, aerospace, and electrical industries where high-temperature resistance is required.


  • Excellent heat resistance
  • High dielectric strength and low electrical conductivity
  • Good flexibility and can be easily molded or shaped into various forms
  • Chemical resistance
  • Long-term durability

Surface Treatment For Rubber Injection Molding Parts

Surface treatment is an essential aspect of our rubber injection molding process. We provide various surface finishing options, such as coatings, textures, and polishing, to enhance the appearance and functionality of the final rubber components. Our expertise ensures a flawless finish that meets your specific requirements.


Bead Blasting

Bead Blasting_Rubber Injection Molding -

Bead blasting in surface treatment is a process where fine abrasive particles, such as glass beads or ceramic media, are propelled at high speed onto a surface using compressed air. This abrasive action helps to remove rust, paint, or other contaminants, leaving behind a clean and textured surface finish.



Smooth, Matte finish

Laser Carving

Laser Carving_Silicone Molding -

Laser carving is a surface finish method that utilizes laser technology to etch or engrave intricate designs onto a material's surface. It offers precise and detailed patterns, making it suitable for aesthetic enhancements or functional purposes, and is commonly used in various industries such as manufacturing, jewelry, and art.


Black, Grey, White, Yellow, Red, Blue, Green, Gold, Silver, Purple

Smooth, Matte finish


Printing_Silicone Molding -

Printing is a surface finish method that involves transferring ink or other pigments onto a material's surface to create images, text, or patterns. It is a versatile technique used in various industries, such as packaging, advertising, textiles, and art, to add visual appeal and convey information.


Black, Grey, White, Yellow, Red, Blue, Green, Gold, Silver, Purple

Smooth, Matte finish


Painting_Rubber Injection Molding -

Painting is especially suitable for the surface of the primary material of metal. It will strengthen the material's moistureproof& rust prevention functions and enhance its compression resistance and internal structural stability.


Black, Grey, White, Yellow, Red, Blue, Green, Gold, Silver, Purple

Smooth, Matte finish

Photooxygen Technology

Photooxygen Technology_Silicone molding -

Photooxygen Technology is a surface treatment method that utilizes the reaction between oxygen and light to modify the surface properties of materials. It enhances surface wettability, adhesion, and durability, making it suitable for various applications in industries such as electronics, automotive, and medical devices.



Smooth, Matte finish

Glue Dripping

Silicone Dripping_Silicone Molding -

Glue dripping is a surface treatment process that involves the application of adhesive or glue onto the surface of a material. This method enhances bonding strength, improves adhesion, and provides a protective coating on various substrates, such as wood, metal, or plastic.

MQ, VMQ, PVMQ, FVMQ, Nitrile Silicone Rubber, BR, PUR

Black, Grey, White, Yellow, Red, Blue, Green, Gold, Silver, Purple

Smooth, Matte finish

Oil-Free Technology

Oil-Free Technology_Silicone Molding -

Oil-Free Technology is a surface finish method that eliminates traditional oil-based lubricants. It employs advanced techniques and materials to reduce friction and provide lubrication, resulting in cleaner, more environmentally friendly operations while maintaining high performance and efficiency.

MQ, VMQ, PVMQ, FVMQ, Nitrile Silicone Rubber


Smooth, Matte finish

Excellent Rubber Injection Molding Services

JIAHUI is the leading rubber injection molding service provider, delivering excellence in every component.

Typical Rubber Injection Molding Products

Die Casting FAQs -

FAQs Related To Rubber Injection Molding

A: Several conditions should be met for rubber injection molding:

1. Material selection: The rubber compound should be suitable for injection molding and have proper flow and curing characteristics.

2. Temperature control: Precise control of mold and material temperatures is crucial to ensure proper flow and curing of the rubber.

3. Injection pressure: Sufficient injection pressure should be applied to fill the mold cavity completely and avoid any voids or defects.

4. Injection speed: The speed at which the rubber is injected into the mold should be controlled to prevent flash or excessive material waste.

5. Mold design: The mold should be designed to accommodate the rubber injection molding process, with proper venting, gating, and cooling systems.

6. Curing time and temperature: The curing time and temperature should be set according to the rubber compound's specifications to achieve optimal physical properties.

7. Post-curing: Some rubber compounds may require post-curing to enhance their properties, so the appropriate post-curing process should be followed if necessary.

8. Quality control: Regular inspection and testing should be conducted to ensure the final rubber products meet the desired specifications and standards.

A: Common problems in rubber injection molding include:

1. Flash: Excessive material escaping from the mold cavity, resulting in excess material around the parting line.

2. Voids: Air pockets or bubbles trapped inside the molded rubber part, leading to weakened areas or defects.

3. Short shot: Incomplete filling of the mold cavity, resulting in a part with missing sections or incomplete shapes.

4. Sink marks: Indentations or depressions on the surface of the molded part caused by uneven cooling or improper material flow.

5. Warpage: Distortion or deformation of the molded part due to uneven cooling or improper ejection from the mold.

6. Mold fouling: Build-up of residue or contaminants on the mold surface, leading to poor part quality or sticking.

7. Poor surface finish: Rough or uneven surface texture on the molded part, often caused by improper mold surface finish or filling conditions.

8. Material degradation: Excessive heat or prolonged curing time can lead to material degradation, resulting in reduced physical properties of the molded part.

9. Dimensional inconsistencies: Variations in part dimensions or tolerances caused by improper mold design, material shrinkage, or processing parameters.

10. Contamination: The introduction of foreign particles or impurities into the rubber material can affect the molded part's quality and performance.

A: Several aspects should be paid attention to in the rubber injection molding process:

1. Material selection: Choose the appropriate rubber compound with suitable flow and curing characteristics for injection molding.

2. Mold design: Ensure the mold design is suitable for the rubber injection molding process, including proper venting, gating, and cooling systems.

3. Temperature control: Precisely control the mold and material temperatures to ensure proper flow and curing of the rubber.

4. Injection pressure and speed: Apply sufficient injection pressure to fill the mold cavity and control the injection speed to prevent flash or material waste.

5. Curing time and temperature: Set the curing time and temperature according to the rubber compound's specifications to achieve optimal physical properties.

6. Post-curing: If required, follow the appropriate post-curing process to enhance the properties of the rubber part.

7. Quality control: Regularly inspect and test the molded parts to ensure they meet the desired specifications and standards.

8. Equipment maintenance: Properly maintain the injection molding machine and mold to ensure consistent and reliable production.

9. Operator training: Provide proper training to operators on the rubber injection molding process, including material handling, mold setup, and troubleshooting.

10. Process optimization: Continuously monitor and optimize the process parameters to improve efficiency, reduce waste, and enhance the quality of the molded parts.

A: There are several common molding methods used for rubber products. Here are some of the most widely used methods:

1. Injection molding: This method involves injecting molten rubber material into a closed mold cavity using a screw or plunger. The material is then cooled and solidified to form the desired shape. Injection molding allows for high production volumes, complex part geometries, and precise control over material distribution.

2. Compression molding: The preheated rubber material is placed in an open mold cavity in compression molding. The mold is then closed, and pressure is applied to compress the material and shape it into the desired form. The material is cured or vulcanized under heat and pressure, resulting in a finished part. Compression molding is suitable for producing simple to moderately complex parts and is often used for low-volume production.

3. Transfer molding: Transfer molding combines injection molding and compression molding elements. The rubber material is preheated and placed in a chamber called a pot. Under pressure, the material is forced from the pot through a runner system and into the closed mold cavity. The material is cured and solidified to form the final part. Transfer molding allows more control over material flow than compression molding and is used for producing parts with complex geometries.

4. Blow molding: Blow molding is typically used to produce hollow rubber products, such as bottles or containers. In this method, a parison (hollow tube) of rubber material is formed and placed in a mold. The mold is closed, and compressed air is blown into the parison, forcing it to material that is then cooled and solidified to form the final part.

5. Extrusion: Although primarily used for producing rubber profiles, extrusion can be considered a molding method for certain rubber products. In extrusion, the rubber material is forced through a die, which shapes it into a continuous profile of the desired cross-section. The extruded profile is then cooled and cut into the desired lengths.

A: Rubber injection molding and compression molding are two different methods used for molding rubber parts. Here are some key differences between the two processes:

1. Mold type: A closed mold with multiple cavities is used in rubber injection molding, similar to the molds used in plastic injection molding. In compression molding, an open mold is used, which is typically made of two halves that are closed together during the molding process.

2. Material preparation: In rubber injection molding, the material is typically preheated and injected into the closed mold cavity using a screw or plunger. In compression molding, the rubber material is preheated and placed manually in the open mold cavity before the mold is closed.

3. Cycle time: Rubber injection molding generally has a shorter cycle time than compression molding. Injection molding allows for faster and more automated production due to the use of a closed mold and injection system.

4. Material distribution: In rubber injection molding, the material is forced into the mold cavity under high pressure, ensuring a more consistent and uniform distribution of the material. In compression molding, the material is compressed and flows into the mold cavity under pressure, which may result in variations in material distribution.

5. Complexity of parts: Rubber injection molding is suitable for producing complex parts with intricate shapes and details, allowing for precise material flow control. Compression molding is ideal for producing simpler, flat, or low-profile parts.

6. Material wastage: Rubber injection molding usually generates less waste than compression molding. In compression molding, excess material is often trimmed off the molded part, resulting in more material wastage.

7. Surface finish: Rubber injection molding typically produces parts with a consistent and smooth surface finish when material is injected into a closed mold cavity. Due to the nature of the process, compression molding may result in a slightly rougher surface finish.

8. Cost: Rubber injection molding typically requires higher initial tooling costs than compression molding, as it involves complex molds and injection equipment. Compression molding, on the other hand, requires simpler molds and equipment, making it a more cost-effective option for certain applications.

Rubber injection molding and compression molding are advantageous and suitable for different types of rubber parts. The choice between the two processes depends on factors such as part complexity, production volume, quality requirements, and cost considerations.

A: Rubber and plastic injection molding are two different processes used to mold rubber and plastic parts respectively. Here are some key differences between the two:

1. Material properties: Rubber and plastic have different material properties. Rubber is elastic, flexible, and has a higher durometer (hardness) compared to most plastics. Plastic, conversely, can be rigid or flexible, and its durometer can vary widely depending on the type of plastic used.

2. Material preparation: Rubber injection molding typically involves preheating the rubber material to make it more fluid and easier to inject into the mold cavity. Plastic injection molding, on the other hand, often uses pelletized or granular plastic resin that is melted and injected into the mold.

3. Mold design: The molds used in rubber injection molding and plastic injection molding can differ in design. Rubber injection molds are typically made of materials that can withstand high temperatures and pressures, since rubber requires higher molding temperatures and pressures than most plastics. Plastic injection molds are typically made from steel or aluminum, and their complexity depends on the part design.

4. Injection process: In rubber injection molding, a screw or plunger is typically used to inject molten rubber material into an enclosed mold cavity. In plastic injection molding, molten plastic resin is injected under high pressure into a closed mold cavity using a screw or plunger as well. The injection process for rubber may involve higher pressures and longer injection times compared to plastic.

5. Cooling and curing: After injection, rubber parts typically require a curing or vulcanization process to achieve their final properties. This involves heating the part in the mold to crosslink the rubber molecules and create the desired physical properties. Plastic parts, on the other hand, do not require curing and can cool and solidify within the mold.

6. Part complexity: The rubber injection molding process is used to produce parts with complex shapes and details because the rubber can flow more easily into complex mold features.Plastic injection molding can also produce complex parts but may have limitations depending on the material and part design.

These are some of the key differences between rubber injection molding and plastic injection molding. The choice of process depends on factors such as material properties, part complexity, production volume, and cost considerations.

A: Rubber modification refers to altering the properties of rubber materials to enhance their performance or meet specific requirements. This can be achieved through various methods, including adding additives, fillers, or reinforcements to the rubber compound.

Here are some common methods used for rubber modification:

1. Additives: Different additives can be incorporated into the rubber compound to modify its properties. For example, plasticizers can be added to improve flexibility and reduce hardness, while accelerators and activators can be used to enhance the curing process. Other additives such as antioxidants, UV stabilizers, or flame retardants can be included to improve resistance to aging, weathering, or fire.

2. Fillers are added to rubber compounds to improve mechanical properties, reduce cost, or modify specific characteristics. Common fillers include carbon black, silica, clay, and calcium carbonate. These fillers can enhance tensile strength, tear resistance, and abrasion resistance and improve dimensional stability.

3. Reinforcements: Reinforcements, such as fibers or fabrics, can be added to rubber compounds to enhance strength and stiffness. Reinforcements like aramid, glass, or carbon fibers can significantly increase the mechanical properties of rubber materials, making them suitable for high-performance applications.

4. Blending: Rubber modification can also involve blending different types of rubber materials to achieve desired properties. For example, blending natural rubber with synthetic rubber can improve the balance of properties such as strength, flexibility, and chemical resistance.

5. Crosslinking: Rubber modification can also involve crosslinking or curing the rubber compound to improve its durability and performance. This is typically achieved through vulcanization, where the rubber is heated with sulfur or other curing agents to create strong chemical bonds between the rubber molecules.

Rubber modification is a versatile process that allows manufacturers to tailor the properties of rubber materials to meet specific application requirements. The choice of modification method depends on the desired improvements and the intended use of the rubber product.

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