Rubber Molding with Inserts

Expert precision, reinforced.

Insert molding is the process whereby metallic or other high temperature resistant materials are overmolded or encapsulated with bonded rubber. Typical insert molded items are used in sealing (valve stems and poppets, sealing plates), in damping (vibration mounts) and in general product reinforcement (strengthening a bolt hole location with a bonded in place washer). By using specialized primers we can vulcanize any rubber material directly onto virtually any substrate (provided the substrate can withstand molding pressure and temperature) and produce a permanent bond that is stronger than the rubber material itself.

Molding Inserts
  • Normally utilizes transfer or injection molding, though compression molding can be suitable for large inserts
  • Substrate must withstand high pressures and temperatures of at least 285F for 20min.
  • Vulcanized bonds are superior in strength to secondary "glued" adhesion and will withstand the same chemical and temperature exposure as the rubber material

Best Suited For:

  • Mid range dimensional tolerances
  • Low to medium volume production
  • Small to medium sized parts
  • Low to medium-high durometer materials
  • Insert molding

Advantages Over Other Methods:

  • Shorter production cycles than compression molding
  • Ability to maintain closer dimensional tolerances than compression molding
  • Excellent uniformity from mold cavity to mold cavity
  • Rapid mold setups
  • Couples some of the advantages of injection molding with the simplicity of compression molding

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