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http://www.kom-key.com/graphic-overlay/

What is Graphic overlay ?
Membrane graphic overlay is an interface layer which is made of polycarbonate or polyester with an adhesive backing. It can be applied to many industries including, Residential and commercial appliances
Machinery control panels Medical equipment
HVAC equipment Gas station pumps
Automotive dashboards

A functional graphic overlay membrane is designed for use with rubber keypads, membrane switches or as a touch screen panel interface for control panels. In these applications, the printed graphics and text are used to providing operational instructions or safety warnings and label buttons and controls.

However, with an aesthetic purpose, decorative membrane switches graphic overlays and panel overlays are printed with custom graphics, company logos or product information. They act as an intermediary between the user and the machine through functional descriptions, without conductive traces or circuitry.

The membrane overlay or control panel overlay material provides a variety of embossed keys, matte or glossy finishes, and a protective overlay coating to reduce the likelihood of fading. It also includes different material thicknesses from 0.125mm to 1mm to meet customers' specific applications.