According to the different materials, mold can be divided into metal molds and non-metallic molds. Metal molds can be divided into: casting molds (nonferrous metals die casting, steel casting), stamping and forging die; non-metallic mould also includes: plastic moulds and inorganic non-metallic moulds.
According to the different material to the mold itself, mold can be divided into: sand moulds, metal moulds, vacuum molds, wax mould and so on. Among them, with the development of polymer plastics, plastic molds are closely related to people's lives. Plastic mold can be classified into: injection mold, plastic molding, gas-assisted injection molding molds, and so on.