Compression molding is a forming process in which a thermoset plastic material is introduced directly into a heated metal mold, is softened by the heat, and forced to conform to the shape of the mold cavity as the mold closes.

Process Characteristics

	Uses thermoset preforms or granules
	Materials are usually preheated
	Material must be accurately measure to maintain uniform size or to avoid excess flash
	Metallic inserts may be molded into the product
	Shape must not have undercuts
	Requires no sprues, gates, or runners