Custom Rubber Injection Molding Services

The technology of rubber injection molding provided by Zhongde, a reliable rubber molding supplier, can be used to produce both solid rubber parts and rubber bonding metal parts. The rubber injection molding process is an ideal manufacturing method for mid-to-high-volume rubber production. This is a process that is fully automated and becomes one of the most efficient ways to manufacture rubber injection molding products in most cases. The custom rubber injection molding services we provide cover butyl rubber injection molding, nitrile rubber molding, silicone rubber injection molding, etc. If you are looking for a rubber injection molding company, Zhongde would be your best choice.

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Injection Molding From Prototyping to Production

Injection Molding Molds Making and Tooling Services

Zhongde, a custom plastic injection molding company in China, can produce the most intricate CNC injection mold, which is up to 78 inches long. In addition, our customize plastic die mold is lifetime guaranteed and machined from high-grade metal.


We have been insisting on developing our own molds for many years, meanwhile, introducing fully automated equipment. Our professional engineer will help to improve the mold design.

  • Injection Molding Service Option: Prototyping & on-demand manufacturing


  • Mold Material: Steel P20, H13, S136, 2316,2344, 083, 718H, SKD618, etc.


  • Mold Type: Family molds, single and multi-cavities 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 size of the Rubber Injection Molding parts we usually make. If you need a larger size, we can also help you achieve it.

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

Rubber Injection Molding Materials

In addition to the general materials listed below, such as liquid silicone rubber injection molding and butyl rubber injection molding, Zhongde, a reputable rubber and plastic injection molding company, can also modify the materials according to the specific needs of customers. Within the estimated cost, our professional engineers will adjust the raw material formula to meet the unique conditions of use.

The general rubber injection molding materials listed below:


If you have special needs for injection molding parts, our professional engineers will adjust the raw materials formula to meet the unique conditions of use.

UV absorbersColorants
Flame retardantsVulcanizing agent

Rubber Injection Molding Types

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.

The below chart shows the different grades of surface finishes.


A-grade finishes are made using a diamond buffing process and yield shiny and glossy surfaces on injection molded parts.

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Semi-glossyB-grade finishes use grit sandpaper to produce parts with a slightly rougher finish than grade A parts. Custom molded plastic parts that undergo B-grade finishing have a matte surface texture.Get A Quote
MatteC-grade finishes use grit sanding stones to produce a rough, uneven surface. Injection plastic parts that undergo C-grade finishing have a matte surface texture.Get A Quote
TexturedD-grade finishes use grit and dry glass beads or oxide to produce a very rough textured finish. Depending on the type of material used, products can have a satin or dull finish.Get A Quote

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 molding quality of the product, 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 plastic (densification) to compensate for the shrinking behavior of the plastic.


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

Related Rubber Injection Molding Resources

Zhongde - A Professional Rubber Injection Molding Company

Zhongde, one of the leading custom rubber injection molding companies in China, is determined to provide customers with considerate rubber injection molding services and superior rubber injection molding products that meet high standards. 

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FAQs of Rubber Injection Molding

What is the minimum order quantity?

We don't have MOQ requirement, 1 piece is available. However, the cost will be lower if the order quantity is bigger. Once the mold is created and the machine is set up, the rubber injection molding parts can be manufactured very fast at a very low cost.

What parameters determine the price of rubber injection mold?

The mold’s price depends on many variables, including its material, complexity, and size. In general, larger and more sophisticated molds cost more than smaller, simpler molds.

What is the advantage of rubber injection molding?

There are many advantages of rubber injection molding. Such as high precision, allow for more complex design, reduce glitter and rubber wast, and very suitable for high-volume production requirements.

How to choose the right rubber materials?

There are some factors to consider when you select rubber material. 1. thermal and physical properties. 2. injection molding capability. 3. aesthetics and dimensional accuracy. 4. Resistance to chemicals and weather. 5. assembly process. 6. monetary cost. 7. environmental impact.

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