Compression Molding

Rapid Prototype and On-demand Manufacturing

Forming Large Size Parts

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Get a quote for tooling and the first batch production.


DFM report will be provided for production confirmation if needed.


You get free samples per part for your approval.


Your parts go into production after samples are approved.

Quality Control

We use the sample to verify future orders and provide QC checks.


Home » Service » Compression Molding

What is Compression Molding Process?

Compression molding is a method of forming plastic or rubber in a closed cavity by heating and hot pressing. First, place a pre-measured and preheated material into an open mold cavity. Then the mold is closed, and high pressure is applied to compress the material and shape it to the desired form.

The compression molding process is high-pressure molding. It is a good choice for manufacturing large pieces, and low-to-medium quantities production with competitive tooling price. Zhongde utilizes hydraulic presses that can control the pressure, and high-strength, high-precision, and high-temperature resistant metal molds to guarantee the quality of molded products. We guarantee high-efficiency production and ensure accurate products, and smooth surfaces by using the compression molding process.


Compression Molding Size Chart

The table below shows the regular sizes of customized compression molded products. If your customization product is in unique sizes, Zhongde will help you realize it at the most competitive price.

Description Metric Inch
Length 3000 118
Width 2500 98.4
Height 2000 78.7

Compression Molding Materials

As a professional on-demand manufacturer, Zhongde offers various compression molding materials to satisfy customer’s requirements. Some of the materials available for compression molding are as below. We also offer material modification services. Our professional material engineers will adjust the raw material formula to meet the unique conditions of use and the special needs of the customer.

Elastomers and rubber are common materials for the compression molding process. Here are Zhongde’s compression molding materials.

  • NR
  • SBR
  • CR
  • VMQ
  • FFKM
  • NBR
  • IR
  • FKM
  • EPDM

Thermosetting plastic materials can be used for the compression molding process because of their excellent heat resistance and dimensional stability. Check Zhongde’s available thermosetting plastic.

  • PTFE

Thermoplastic elastomers(TPEs) with excellent elasticity, flexibility, and resilience. Please check Zhongde’s thermoplastic-elastomers (TPEs) materials.

  • TPE
  • TPV
  • TPU
  • TPR

Compression Molding Surface Finishing

Proper surface finishing will improve the molded parts’ quality. Zhongde offers a wide range of surface treatment options. These efficient surface finishes improve the part’s functions and aesthetic appeal.

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.

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surface finish Semi-glossy


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

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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.

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surface finish Textured


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

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our quality promise

Our Quality Promise

Zhongde is committed to providing quality products that meet or exceed the needs of our customers through continuous improvement.


Strictly follow the confirmed drawings or samples to produce. If there is any deviation, our company will replenish to our customers to make up for the loss.

Compression Moulding Fundamentals

  1. The material is placed into the mold.
  2. The product is heated until somewhat soft and pliable.
  3. A hydraulic tool presses and closes the molds together.
  4. Once the material is hardened, open the mold and the ejected pin will eject the custom parts out.

Click here to learn common problems and solutions of compression molding.

Compression moulding is a composite manufacturing process normally used to produce larger flat or moderately curved composite parts.

There are five advantages of compression molding services.

  1. Less mold structure with competitive tooling price.
  2. Evenly heated mold cavity with good dimensional stability.
  3. Little material waste suitable to work with expensive material.
  4. Available for forming large flat products.
  5. More than hundreds of colors to choose from.

Click here to learn advantages and disadvantadges of compression molding process.

Compression molding is more suited to process pliable and flexible materials, such as elastomers, thermoplastics, and rubbers. So, if your custom parts materials are pliable and flexible materials, the compression molding process is better.

Compression molding is suitable for a variety of products, such as automotive parts, electrical insulators, seals, gaskets, consumer goods, and industrial components.

Cycle times can vary depending on factors like material type, part complexity, and curing requirements, but they generally range from a few minutes to several minutes.

Why Choose Zhongde As A Compression Molding Company

Zhongde is a reputable on-demand manufacturing company with custom compression molding services. We have extensive expertise, state-of-the-art facilities, commitment to quality, efficient production capabilities, competitive pricing, and dedication to customer satisfaction.

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

Custom Compression Molding Parts

Compression molding is better suited for achieving consistent and efficient material distribution in thick-walled parts compared to injection molding. The compression molded products included rollers, boots, corners, etc.

FAQs of Compression Molding Manufacturing Services

View our FAQ center for more questions.

Thermoset resins, thermoplastic resins such as polypropylene, nylon, UHMWPE, HDPE and etc can be used for compression molding.

Yes, Compression molding is well-suited for both small and large production runs, and Zhongde offering cost-effective manufacturing options for a wide range of quantities.

Common defects include flash, voids and porosity, uneven curing, and delamination during the compression molding process. However, these defects can be minimized through proper mold design, precise temperature and pressure control, and material selection.

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