Cast Molding

Cast molding is efficient and results in a fast production time.

  • Rapid prototypes
  • Cast Urethane
  • On-demand production parts


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 » Cast Molding

What is the Cast Molding Process?

The cast molding process or cast urethane refers to pouring liquid raw materials into a mold and turning the material into a solid state.

Zhongde has many years of cast molding experience. Our experienced engineers can accurately analyze whether the product is suitable for casting products according to the product structure.

We rapid prototypes and mass production with high standards. Zhongde provides various cast molds at a competitive price. Such as steel cast molds, aluminum cast molds, and brass cast molds. All the cast molds are reusable.

cast molding

Cast Molding Molds Making and Tooling Services

Zhongde makes all the molds in-house. 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. In addition, our custom die mold is lifetime guaranteed.

Item Details
Rapid Tooling Mold working lifetime up to 20,000 runs.
Production Tooling Traditional molds are used for mass production.
Mold Type Family molds, Single cavity molds and multi-cavity molds.
Multi Cavities Moulds More than one part per cycle.
Family Moulds Produce two or more different sizes and shape parts per cycle.
Mold Material Steel P20, H13, H136, 2316, 2344, 083, 718H, SKD618, etc.
Mold Storage 3 years in inactivity
Mold warranty Lifetime warranty on production molds.
Mold Remachining We can re-machine the molds if there are any changes required, basis on mold structure.
Maximum Dimensions 2500mm*2000mm

Cast Molding Size Chart

The below table shows the regular size of the custom cast molding parts. If you need a unique size product design, Zhongde a professional China precision on-demand cast urethane manufacturer, will help you achieve it at a competitive price.

Size Metric Inch
Length 2500 98.4
Width 2000 78.7

Cast Molding Materials

Cast molding may have a more limited range of material options compared to injection molding and compression molding. Below list is the of general materials for cast molding. However, our expert team can work with you to modify the material if you have specific project requirements.

  • PU | Polyurethane
  • LSR | Liquid Silicone Rubber

  • MC Nylon
cast molding materials

Cast 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.

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.

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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.

Advantages of Cast Molding

The cast molding process (cast urethane) makes high-quality prototype components using two-component polyurethane resins and silicone molds. Compared with other on-demand manufacturing, cast molding has many advantages.

The Advantages include as below:

  • Low-volume production
  • High accurate production
  • A wide variety of finish options
  • Rapid turnaround on parts
  • Durability for maximum wear and strength

Difference Between Cast Molding and Injection Molding

Cast molding involves pouring molten material into a mold cavity and allowing it to cool and solidify, taking the shape of the mold. It is suitable for producing large, complex parts with intricate details and varying wall thicknesses. Cast molding offers design flexibility but may have longer production times and limited material options.


Injection molding, on the other hand, injects molten material into a mold under high pressure. It allows for high-volume production of parts with precise dimensions and complex geometries. Injection molding offers faster cycle times, a wide range of material choices, and tighter tolerances compared to cast molding. However, it requires upfront tooling costs and is better suited for mass production.

The Urethane Casting Process

Urethane casting is the process of injecting polyurethane and additive resins into a soft mold made of a silicone elastomer. Urethane casting is an easy, straightforward process. Below are the steps in making urethane cast products.

Developing the Master Pattern:
Create master patterns using various materials like plastic, and metal by CNC machining or 3D printed prototypes. This master pattern is the exact replica of the final part.

Mold Creation:
A two-part mold is made from silicone rubber or another suitable material. The master pattern is placed inside the mold, creating a void that matches the part’s shape.

Urethane Resin Mixing and Pouring:

Choose suitable urethane resin and mix it according to specification. Then pour mixed materials into the cavity.

Curing and Demolding:
Place the mold to solidify in an oven or at room temperature. Once the resin has cured and solidified, open the mold, and remove the casting product carefully.

Trimming and Finishing:
Trimming, sanding, or post-processing the cast urethane part to meet specific tolerances and surface finish requirements.

Zhongde-Your Urethane Cast Manufacturer

Zhongde has extensive experience, advanced equipment, and a commitment to quality. We offer competitive pricing, fast turnaround times, and excellent customer service. With a skilled team and state-of-the-art facilities, we ensure precise and reliable production. Whether you need rapid prototyping or high-volume on-demand manufacturing, Zhongde is your trusted partner for custom cast molding solutions.

Start A New Project Right Now!

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

Cast Molding Parts

The cast molding process is suitable for producing low-volume and highly accurate products. Here are some cast product samples we made before.

FAQs of Cast Molding Service

View our FAQ center for more questions.

The lead time varies depending on factors like mold design, material availability, and production schedule. We aim to provide an estimated timeline based on your project requirements.

Yes, we offer sample production or prototyping services to ensure the final product meets your expectations before proceeding with full-scale production.

Yes, we can accommodate design modifications within the scope of the project. Our team works closely with you to ensure any necessary changes are implemented effectively.

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