Membrane Switch Panel Overlay Materials: The most commonly used base materials are polyester and polycarbonate. Rear Adhesive: 3M 467MP, 3M 468MP, etc. Standard Tolerances: +/-.010 inch. Matching color: Pantone and RAL color matching system. Environmental • Storage Temperature: -40°C (-40°F) to +70°C (158°F). • Storage Altitude: Sea level to 35,000 feet. • Operating Temperature and Altitude: -30°C (-30°F) to +75°C (170°F). Can be designed to operate in most environments. • Humidity: No delamination after 24 hours at 80°C and 90%RH. Feature: • Second surface printing • Scratch resistance • Custom design