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Overmolding vs Insert Molding

    Overmolding vs Insert Molding

    Overmolding and insert molding are two plastic injection molding processes used to combine multiple materials into a single part. Both processes involve molding a substrate material and then adding a second material to create a finished part. However, there are some differences between the two processes.

    Overmolding vs Insert Molding


    Overmolding is a process that involves molding one material (the substrate) over another material (the overmold). The substrate material is typically a rigid plastic, while the overmold material is a softer, more flexible material like TPE or silicone. Overmolding is often used to create handles or grips on tools and appliances, as well as to add logos or branding to products.

    Overmolding is a two-step process. First, the substrate material is molded into the desired shape. Then, the overmold material is injected over the substrate material. The two materials bond together during the molding process, creating a strong, cohesive part.

    Insert Molding

    Insert molding is a process that involves molding a substrate material around an insert. The insert can be a metal component, a plastic component, or even an electronic component like a circuit board. The insert is placed into the mold, and the substrate material is injected around it. This creates a strong, one-piece part that combines the properties of both materials.

    Insert molding is often used to create complex parts that require multiple materials or components. It can also be used to add strength or durability to a part by molding a metal insert into a plastic part.


    Both overmolding and insert molding are powerful tools for creating complex, multi-material parts. Each process has its own strengths and weaknesses, and the choice of which process to use will depend on the specific requirements of the part being produced. By understanding the differences between these two processes, manufacturers can choose the best method for their needs and create high-quality, durable parts.