Combine multiple parts to form one plastic product.

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Overmolding lets you combine multiple materials into one part. One material, usually a thermoplastic elastomer, is molded onto a second material, which is often a rigid plastic. An example is a toothbrush handle where the single piece has both rigid and rubbery components. It’s a great way to make plastic parts perform and look better.

Overmolding typically includes a rigid, plastic-base component overlaid with a thin, pliable, rubber-like exterior layer or other similar material. The introduction of a soft, non-slip grip prevents dropping and also acts as an environmental barrier to shock, vibration, and noise to maximize product longevity.

Additional advantages include:

  • Strength: Rubber compounds on the exterior of plastic parts can help the piece resist water or absorb sound and/or serve as electrical insulation.
  • Durability: Overmolding can help keep dust and water out of plastic components, making them last longer.
  • Efficiency: Overmolding can help add a second layer that can make grips more comfortable on any parts that people hold or grasp.

Industries that use overmolding include medical, packaging, automotive, consumer electronics, building, construction, and robotics.

TMI is a leader in overmolding techniques, ensuring high part precision, cost-effective high volume production, and significant reduction of costly and cumbersome assembly operations.

There are hundreds of applications for the overmolding process. Consult with a TMI expert to find out the best means to produce your product or component.