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Knob & Thumbscrew Parts

Insert Molding is an injection molding process that utilizes an insert placed in the molding cavity.

A molecular bond is established when using materials that are similar to the surrounding resin. A mechanical bond is established when using materials that are dissimilar to the surrounding resin. When comparing the two, for obvious reasons the molecular bond is stronger than the mechanical. For best results in using the mechanical bond process, it is important to use an insert that is capable of handling the surrounding plastic.

Insert molding can be used for molding fasteners, pins and terminals, and is widely used for molding parts needed in constructing medical equipment.

A variety of materials are used in insert molded plastics. These include:

  • ABS
  • Hi-Impact Styrene
  • Nylon
  • Acetal
  • Polycarbonate
  • Rigid PVC
  • Flexible PVC
  • Many various types of filled materials:
    • Glass Filled Nylon
    • Valox
    • Norel
    • Flex PVC - Thermo Plastic Rubbers
    • Rigid PVC - Injection Large, Small
  • Many various types of exotic materials