Blog

What is Silicone Casting?

Posted on Apr 03, 2020 by Cullen Hikene

Silicone casting is a simple and accurate casting process that will forgive many mistakes. The silicone rubber material comes in two components that mix by a volume ratio of 1:1. Propanol alcohol is used to clean the polymers before they cure. The casting material used to make parts also mixes on a volume basis of 1:1.

3Diligent example process: urethane casting

What are the Different Types of Silicone Casting Processes?

  1. Soft Tool Casting (Silicone Tool)

What are the Advantages of Silicone Casting?

  • Accurate. Highly precise part creation with complex geometries available, even at higher batch sizes.
  • Great for Prototypes. Relatively short lead times for silicone casting processes allow prototypes to be deployed and tested quickly in the product development lifecycle.
  • High Quality and Flexibility. Resins can be manipulated and engineered to achieve a variety of material characteristics specific to the needs of the project.

What are the Limitations of Silicone Casting?

  • Higher Cost. Silicone casting usually features a higher startup cost than urethane casting methods.
  • Shrinkage. Some shrinkage, ~1%, can occur when using tin-cured silicone rubber.

 

Key Metrics

Standard Tolerance
.0127mm

Lead Time
15 Business Days

Maximum Size
24″×24″×24″

Minimum Feature Size
.127µm

Minimum Wall Thickness
500µm

Conclusion

Silicone casting is an established technology in the casting space that brings new-age materials to this traditional foundry process. Consider submitting an RFQ through manufacturing services such as ProdEX to get started today.

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