Compression Molding
Compression Molding is one of three processes used to mold rubber parts. Compression molding is the oldest and simplest way to make rubber products. In some specific applications, compression molding is still the best way.

To put it simply, compression molding involves squishing a chunk of uncured rubber into a pocket in the mold. After time, heat and pressure the rubber cures in the shape of the pocket. The mold can then be opened and the part removed.

A piece of uncured rubber is placed in the mold.

The mold is closed up and held under hydraulic pressure while the rubber cures.

When the mold opens the part can be removed. The excess rubber, called flash, needs to be trimmed off the part.

Advantages of Compression Molding
  • Lower cost molds
  • Little "throw away" material provides advantage on expensive compounds
  • Often better for large parts
Disadvantages of Compression Molding
  • Offers least product consistency
  • Difficult to control flash
  • Not suited for some types of parts
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