Overlay (Label, Graphic overlay,overlay keypad) 1 Overlay Materials: The most commonly used materials are polyester(PET) and polycarbonate(PC). 2 Rear Adhesive: 3M 467MP, 3M 468MP, etc. 3 Matching color: Pantone and RAL color matching system. 4 Gloss, semi-gloss or matte 5 Non-tactile,poly dome or metal dome6 Standard Tolerances: +/-.010 inch (+/-0.25mm). Performance Electrical Operating Voltage: ...