What is the Difference Between Overmolding vs Insert Molding?

 

Overmolding

Overmolding involves molding a material, typically a soft or elastomeric material like rubber or silicone, over a pre-formed substrate or part. This allows manufacturers to create parts from multiple materials or add necessary aspects of a different material easily. Overmolding is often used to provide additional functionality, improve aesthetics, or enhance grip and comfort.

This manufacturing method uses a two-stage process. A molten thermoplastic is injected into the shot, forming the rigid portion of the part. Then, another shot that is generally more flexible is injected in, on top of, or surrounding the rigid portion. The two separate portions bond together as they cool, creating a durable part.

Insert Molding

Insert molding is an injection molding process that forms plastic parts around other non-plastic parts, which are typically metal. This manufacturing process is commonly used to incorporate metal components such as threaded inserts, electrical contacts, or reinforcing inserts into plastic parts.

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