... non-toxic, environmental safe (2) Hardness:30 to 70 Sh remote control keypad: 1 Material: made of top grade silicone rubber, non ... /ISO-1400,RoHS approval4 Silk screen printing, spay coating, laser etching, back-lighted, hard/epoxy coating keypads5 Keypad surface ... with transparent spraying coating, PU coating6 Automatic painting and laser etching process7 Half automatic potting process to add resin on ...