Compression molding is commonly used in manufacturing thermoset plastic parts. It is like making waffles in a waffle iron. The materials for compression molding are usually in the form of granules. A two-part mold is heated and the material is placed in the open mold. The molds close under pressure and force the material to fill up the entire mold. Then the molds are separated and the molded part is pushed out of the mold by ejector pins.
This process is commonly used for making electrical parts, kitchenware, handles, buttons and large container.