Overmolding is a unique custom plastic injection molding process that chemically bonds multiple materials into a single part.
Overmolding is often cheaper and more effective than other manufacturing approaches that require creating and assembling component material parts separately. The overmolding process can also be used to build layered parts from scratch or add resistant outer layer to existing plastic parts and tools. Toothbrushes consisting of a solid plastic body and rubberized grip are a common example of an over-molded product.