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What Is Overmolding Used For
Nov 14, 2017

          The overmolding process is utilized for a number of reasons that vary according to the specifics of the particular project. Common materials include toothbrushes, tool handgrips (e.g. cordless drills and screw drivers), and personal care products (e.g. shampoo bottles and shaving razors).

Here are some examples of typical overmolding applications:

         Plastic Over Plastic - First a rigid plastic substrate is molded. Then another rigid plastic is molded onto or around the substrate. The plastics could differ in color and/or resin.

         Rubber Over Plastic - First a rigid plastic substrate is molded. Then a soft rubber or TPE is molded onto or around the substrate. This is often used to give a soft grip area to a rigid part.

         Plastic Over Metal - First a metal substrate is machined, cast or formed. Then, the substrate is inserted into an injection molding tool and the plastic is molded onto or around the metal. This is often used to capture metal components in a plastic part.

         Rubber Over Metal - First a metal substrate is machined, cast, or formed. Then the substrate is inserted into an injection molding tool and the rubber or TPE is molded onto or around the metal. This is often used to provide a soft grip surface

A few things to note:

  • There are limitations and compatibility issues to consider between different materials.

  • You are not limited to only two materials. We have seen some products with three different materials on one part in order to achieve color breaks and grip surfaces. Here is a simple example with a product you will be intimately familiar with: scissors.


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