Compression Molding

Is compression molding right for your project?

Talk to our molding experts today.

Compression molding has been a viable solution for parts developers since the 1890s.

This process is used to form various rubber compounds into different shapes. Compression molding is a great solution if you need to create regular or contoured 3D parts and products.

Compression molded products can be durable, sterile, versatile, flame retardant and generally resistant to impact, vibration, chemicals and bacteria.

The process follows some time-tested steps:

  • Take a specific size and weight of uncured rubber, pre-heat in an oven until it is pliable, and then place it in an open mold.
  • Once the part is in the mold, close a hydraulic press over it. The press puts pressure on the compound, causing it to make contact with the entire mold surface, taking on its shape.
  • Once it has assumed the shape of the mold, allow the rubber compound to cool and harden.
  • After this, open the mold and remove the new part or parts.

When deciding whether compression molding is the answer to your needs, there are advantages and disadvantages that should be considered.

Advantages: Lower initial cost; best for low volume projects; good for large components; can accommodate over-mold or rubber bonded to metal or other material parts.

Disadvantages: Labor intensive compared to injection molding because of more human handling; more wasted material compared to injection molding; higher cycle time.

Not sure what’s best for your needs? Consult with a TMI expert today.