PU coating rubber silicone keypad with conductive carbon pill

PU Coated Silicone Keypad, also called PU Coated Rubber Keypad & Keyboard, which is aim to increase the abrasive resistance of silk screen printing & laser etched legends (symbols), color coating on silicone rubber keypad & buttons surface.

Spraying PU coating is a common method, which can improve the service life of silicone rubber keypads and at the same offer good handle touch feeling.

How do Rubber Keypads Work？

A rubber keypad membrane switch uses compression-molded silicone rubber with conductive carbon pills or with non-conductive rubber actuators. 

The compression molding process creates an angled web around a keypad center. 

When a keypad is pressed, the webbing collapses or deforms to produce a tactile response. 

When the pressure on the keypad is released, the webbing returns the keypad to its original position with positive feedback. 

The closure of the switch circuit occurs when the conductive pill or printed conductive ink makes contact to a PCB when the web has been deformed.