Process Description
Resin casting is the filling of a mold with liquid resin that is hardened and then the part can be removed. The resin is typically filled with sand, talc or other fill material to reduce cost and reduce the heat generated during the hardening of the exothermic resin binder. The high level of fill material used in cast products allows the parts to be lower cost than many other forming methods that produce comparable components. The method also generates very little scrap, since parts can often be easily customized to fit the desired application. Commonly, a thermosetting binder resin is combined with filler material and then mixed with a curing agent at room temperature and normal pressure. As soon as the curing agent is added, the mixture is gravity poured (cast) into the mold. To minimize air entrapment the molds can be passed over a vibration table or a vacuum chamber can be utilized.