Molding Plastic Over Plastic

Thermoplastic Rubbers are a great solution for creating grips, buttons, and low-pressure gaskets to name a few.  In this application, Modern Molding’s customer required a cosmetic finish on the hard outer service housing and a pressure sensitive button protruding though the cover with a sealing gasket on the inner surface.

In this application, the customer seals an electronic pc board inside the part.  The thermoplastic rubber creates a gasket for the cover.  A pressure sensitive button is molded through the hole.  Both the cover and the button are considered highly cosmetic parts. 

Thermoplastic Rubbers are available in a variety of durometers.  They range from soft-to-the-touch to fairly rigid depending on the need in application.  This plastic can be used for stand-alone products, or can be molded over metals or other plastics depending on the application needs.