The circuits to be used as membrane switches are normally single layer and double layer rigid printed circuit board and flexible printed circuit board.
They are often used in applications where high reliablity and stablity is required, such as medical, air and sea freight, railway transportation and others with high temperatures, humidity and corrosive factors.
Read about other types of membrane switches
Back-lit membrane switch
Membrane switch for medical devices
Capacitive touch screen/resistance touch screen
Touch display module/capacitive touch screen humen interface module
Silicon gel button switch and bank plate membrane button switch
outdoor anti-water and UV membrame switch