Rubber Injection Molding

As a professional rubber injection molding manufacturer, Zhongde introduced rubber injection molding machines and automatic machines for low-volume and mass production requirements.

Get custom prototypes and rubber molded parts at competitive prices. Upload your design and get an instant quote.

Home » Service » Injection Molding » Rubber Injection Molding

Zhongde Rubber Injection Molding Service

rubber injection molding process

Zhongde is a reliable rubber moulding supplier. The rubber injection molding technology can be used to produce both solid rubber parts and rubber bonding metal parts. The same as plastic injection molding, Our custom rubber injection molding service covers butyl rubber injection molding, nitrile rubber molding, silicone rubber injection molding, etc. The fully automated rubber injection molding process is the most efficient way to manufacture custom silicon injection molded products. If you are looking for a rubber injection molding company, Zhongde would be your best choice.

Injection Molding Molds Making and Tooling Services

Zhongde is an on-demand manufacturer from mold designing and rapid prototyping to mass production. We offer custom mold-making, prototype tooling, and production tooling services. Our experienced team utilizes advanced CAD/CAM software and state-of-the-art equipment to injection mold design, mold making, and maintain molds with exceptional precision and durability for high-quality custom molded parts. Check our injection molding capabilities and tooling services below.

Item Details
Injection Molding Service Options Prototyping & on-demand manufacturing
Insert Molding Inserts are placed into the mold and molding occurs around them. This allows for inserts such as helicoids to be molded in your design.
Overmolding Premade parts are placed into the mold to mold over them. This allows for multi-material injection molding.
Mold Material Steel P20, H13, S136, 2316, 2344, 083, 718H, SKD618, etc.
Production Tooling Traditional molds, used for mass production.
Mold Type Family molds, Single cavity molds, multi-cavity molds, two plate molds and three plate molds.
Mold Storage Stored for 3 years in inactivity
Guaranteed Mold Life Unlimited
Mold Remachining We can re-machine the molds if there are any changes required, basis on mold structure.

Rubber Injection Molding Size Chart

The below table shows the regular size of the custom rubber injection molding parts. If you need a larger size or other unique requirements about the size, Zhongde as a professional China precision rubber injection molding manufacturer, can also help you achieve it at a competitive price.

Size Metric Inch
Length 2500 98.4
Width 2000 78.7
Height 1500 59

Rubber Injection Molding Materials

At Zhongde, we not only offer a wide range of injection molding materials but also provide additives to meet special requirements. Our professional material expert can customize the most cost-effective materials to meet your specific needs. There is our injection molding materials and additives list for your reference.

The general materials are listed below for custom rubber injection molding.

  • Silicone
  • EPDM
  • PVC
  • TPE
  • TPU
  • TPV
If the standard materials can’t meet your custom injection molding parts requirements, the additives and fibers can improve the material properties.
  • UV absorbers
  • Flame retardants
  • Plasticizers
  • Colorants
  • Vulcanizing ageent
  • Tackifiers

Rubber Injection Molding Types

The rubber molding can be divided into 3 types based on the rubber material properties. They are butyl rubber injection molding, nitrile rubber injection molding, and LSR liquid silicone rubber injection molding. Here are some custom rubber molded parts for each type of rubber injection molding.

Rubber Injection Molding Surface Finishing

Injection molding surface finish is critical to a successful part design and it is used for aesthetic and functional reasons in injection molded parts for engineering products. The surface finish improves the look and the feel of a product as the perceived value and quality of the product increase with a suitable surface finish.

Different grades of surface finishing chart.

surface finish Glossy


A-grade finish is smooth and highly reflective, giving the product a shiny appearance. It’s often used for products where aesthetics are important.

Learn more>>

surface finish Semi-glossy


The B-grade finish is less reflective than glossy but still has a smooth and somewhat shiny appearance.

Learn more>>

surface finish Matte


C-grade finish is non-reflective and has a dull appearance. It’s often chosen for parts where glare or light reflection is undesirable.

Learn more>>

surface finish Textured


D-grade finishes are intentionally rough or patterned. They can provide a better grip or a unique appearance to the product.

Learn more>>

The Rubber Injection Molding Process

The rubber injection molding process mainly includes 4 stages, such as filling, pressure maintaining, cooling, and stripping. These 4 stages directly determine the custom rubber moulding products’ quality, and these 4 stages are a complete continuous process.


1. Filling stage
The filling is the first step in the entire injection cycle. The time is calculated from the beginning of injection when the mold is closed until the mold cavity is filled to about 95%.


2. Pressure-holding stage
The role of the pressure-holding stage is to apply continuous pressure to compact the melt and increase the density of the rubber (densification) to compensate for the shrinking behavior of the rubber.


3. Cooling stage
In injection mold, the design of the cooling system is very important. A well-designed cooling system can greatly shorten the molding time, improve injection molding productivity, and reduce costs.


4. Demoulding stage
Demoulding is the last step in an injection molding cycle. There are two main ways of release: ejector rod release and stripper plate release.

rubber injection molding process

Zhongde - A Professional Rubber Injection Molding Company

Zhongde, one of the leading custom rubber injection molding companies in China, provides rapid prototyping and on-demand manufacturing. We are determined to provide customers with considerate rubber injection molding services and superior rubber injection moulding products that meet high standards.

Start A New Project Right Now!

Our sales team will contact you within 24 hours. We are glad to answer your questions.

Industrial Rubber Injection Molding Products

Our rubber injection molding services are perfect for addressing the various demands of different industries, including automotive injection molded parts, Marine custom molded parts, consumer electronics custom rubber parts, home appliances molded parts, food production, etc.

FAQs of Rubber Injection Molding Service

View our FAQ center for more questions.

The lead time depends on factors like part complexity, quantity, and current production schedule. We provide estimated timelines based on your project details.

Yes, our team can provide design assistance and engineering support to ensure your rubber parts meet your specifications and perform optimally.

We have stringent quality control processes, including inspections, testing, and adherence to industry standards, ensuring the highest quality of the molded rubber parts.

Depending on the stage of production, modifications may be possible. We will work with you to accommodate any necessary changes.

Related Service of Zhongde On-demand Manufacturing

CNC Milling

Overmolding & Insert Molding

CNC Turning

Fused Deposition Modeling

Selective Laser Sintering

Plastic Injection Molding