Compression molding uses a heated mold and semi-solid heated material. The material is usually a thermosetting resin, composite thermoplastic, or elastomer. Fiber glass is typically molded using this method. It is most commonly used to create large curved parts in the automotive industry. Material is usually placed in the heated mold in a putty form or as a heated sheet. The heated material is then pressed by the corresponding mold plunger to spread the material and flatten it to conform to the mold walls. Once the material has set in the mold it is ejected and can be further processed. This usually entails trimming and shaving the product to create smooth edges. Compression molding is also used to create flatware, gears, electronic parts, appliance housing.
