Cast Molding Service


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 » Services » Cast Molding
what is urethane casting

What is urethane casting?

Cast molding refers to the processing process in which liquid raw materials are poured into a mold and cooled and solidified at room temperature. Zhongde has many years of casting experience. Our experienced engineers can accurately analyze whether the product is suitable for casting products according to the product structure.


For example, Zhongde will offer and recommend reusable metal casting molds for customers who need mass production of making identical products. The reusable metal casting molds are useful since they can be used repeatedly. Zhongde provides casting for different metal casting molds with 3D printing such as silicone casting molds, steel casting molds, aluminum casting molds, and brass casting molds.

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 and machined from high-grade metal. 

  • Rapid Tooling: Mold working life time up to 20.000 runs. Short machined time.
  • Production tooling: Traditional molds, used for mass production.
  • Multi Cavities Moulds: Moulds can produce more than one part per cycle, used to increase the production rate.
  • Family Moulds: Moulds produce two or more different parts per injection cycle, the parts should be of the same material and color.
  • Mold Material: Steel P20, H13, S136, 2316, 2344, 083,718H, SKD618, etc.
  • Mold Type: Family molds, single and multi-cavities molds.
  • Mold Storage: 3 years inactivity.
  • Mold Remachining: We can re-machine the molds if there are any changes required, on the basis of mold structure.
  • Mold Warranty: Lifetime warranty on production molds.
  • Maximum Dimensions: 2500mm*2000mm

Cast Molding Size Chart

The below table shows the size of the Casting 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

Cst Molding Materials

Cast molding does not offer a huge number of material options when compared to injection molding. But, we offer material modification services to meet your requirement.

  • PU | Polyurethane
  • LSR | Liquid Silicone Rubber

  • MC Nylon
cast molding materials

Cast Molding Surface Finishing

Cast 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.

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

Cast molding makes high-quality prototype components using two-component polyurethane resins and silicone molds.


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 Molding and Casting

Casting typically uses the material of metal which is melted in the die to create the final form, while molding uses the material of plastics which is melt in a mold to generate the final form. Generally, molding is faster than casting in the process so it’s better to choose to mould when you need to produce a large number of products. Molding is also suitable for various materials. However, if you pursue the accuracy of the products of high-quality, casting is a better choice.

The Cast Molding Process

casting process

Cast molding is a manufacturing process in which liquid carbamate material is injected into a silicone mold, post-cured in an oven, and the desired plastic parts are removed from the mold. Secondary machining of molded parts can also be performed if necessary. Carbamate castings are suitable for small batch parts and prototypes, as silicone molds usually only cast about 20-25 parts. A major advantage over other plastic parts manufacturing processes, such as injection molding, is that silicone molds can be made quickly and relatively cheaply compared to hard molds.

Step 1.  create the mold from the “mother mold”. Master patterns can be created using CNC machining, additive manufacturing (3D printing), or using existing products.

Step 2. The pattern is encapsulated in a rapidly curing liquid silicone to form a cavity within the mold that will be used to form the polyurethane parts.

Step 3. Once the mold is cured, cut it in half,

Step 4. Remove the pattern.

Step 4. The cavity formed from the master pattern is used to cast the final product.

Urethane castings are ideal for the rapid production of high-quality, accurate and consistent parts. 

Zhongde-Your Cast Urethane Manufacturer

Zhongde is one of the professional cast urethane manufacturers. The polyurethane casting process starts with 3D printing of the main pattern using silicone rubber molds. Polyurethane casting is a fast and cost-effective method to produce end-use plastic parts on a small to medium scale. Zhongde is proficient in various materials and formulas with the suitable ability to execute the casting process efficiently and with the quality promised by our technology.

Let's Start A New Project Right Now!

Cast Molding Parts

FAQs of Cast Molding Service

What is the difference between cast nylon and extruded nylon?

Cast nylon tends to be slightly more ductile than extruded 6/6 nylon, it can procduced in much larger shapes and tends to be more cost-effective in larger cross-section shapes.

What is the difference between molding and casting?

Molding or Mold making is the act of creating the cavity that carries a negative or reverse impression of an original model. Casting is the act of pouring liquid material into the cavity of a mold.

Does casting resin shrink?

All resins shrink when they change from liquid to solid and all generate heat as they polymerize, and this causes problems. Because heat accelerates chemical reactions, all resins cure from the inside out.

Leave a Message

Please leave your message here! We will send detail technical info and quotation to you!

Knowledge Hubs