Insert Mold & Over Mold

What Is Insert Overmolding?

Insert overmolding is an injection molding process in which a preformed insert, such as a metal component or another compatible substrate, is placed into a mold and encapsulated or partially covered with molten plastic or elastomer. After the material cools and solidifies, the insert and molded material form an integrated component designed to meet specific mechanical and functional requirements.

This process can combine the strength and rigidity of metal with the design flexibility, insulation, grip or sealing properties of plastics and elastomers. Depending on the material combination and part design, insert overmolding can reduce secondary assembly operations, improve component integration and provide additional protection for selected functional features.

TRENDY provides custom insert overmolding solutions for prototypes, low-volume orders and production projects. Our services include insert and material selection support, mold design and manufacturing coordination, injection molding, secondary processing and quality inspection according to project requirements. We work with customers to evaluate part geometry, insert positioning, material compatibility and bonding or mechanical retention requirements to support manufacturability and consistent part quality.