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Injection Molding Process

Overmolding

Description

Molding two plastics together to form one part with two colors or different materials into one part. Overmolding starts by molding a single material, typically the harder material, in a mold and then ejecting it and cleaning off the gates. This part is known as the substrate and is then placed into a second mold to be molded over with a second material known as the overmold.


This process provides a complex part with two materials that are chemically bonded to each other. Examples of this type of molding are toothbrushes, surgical instruments, or power tool handles.

Benefits

Great process for 2 material parts that are:

  • Lower volumes – Under 10,000 parts
  • New product development – Prototype
  • Require mechanical interlocks

overmolding

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