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Compression molding is an old and widely used molding process for thermosetting plastics. Its applications also include thermoplastic phonograph records, rubber tires, and various polymer matrix custom mold parts. The process, illustrated for a TS plastic; consists of (1) loading a precise amount of molding compound, called the charge, into the bottom half of a heated mold; (2) bringing the compressing mold halves together to compress the charge, forcing it to flow and conform to the shape of the cavity; (3) heating the charge by means of the hot mold to polymerize and cure the material into a solidified part; and (4) opening the compressing molds halves and removing the part from the cavity.

Compression molding for thermoplastics: (1) charge is loaded, (2) and (3) charge is compressed and cured, and (4) opening the mold halves and removing the part from the cavity.

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