ALMAX manufactures metal resistive membrane switches that are designed for rugged environments. The stainless steel overlay and keys can be combined with a fully sealed switching unit.
The metal membrane switching unit can be sealed against contamination including dust, water, sea water and oils. It also provides resistance against detergents and chemicals. If needed, the metal membrane switch can be designed to IP67 specifications to provide protection from even the harshest conditions.
Circuitry can be silver flex, copper flex, or rigid PCB. The force to actuate keys can be designed to activate the switch while minimizing the risk of accidental actuation.