Many options are available for shielding membrane switches.
Either carbon or silver can be printed over the top of the circuit to act as a shield or aluminum foil can be used. Carbon shields are less expensive than silver. A printed grid pattern is normally used to reduce cost and can be terminated to the circuit tail.
Aluminum foil material is the most conductive shield available but the most expensive. A foil shield adds an additional layer to the membrane switch construction. The foil termination requires a separate tail for ground connection.
Top Surface Shielding
Graphic overlay ESD material can be another option. Contact us for termination requirements.
ITO coated polyester can be used to provide a conductive surface for clear window areas. ITO is transparent and is used with other shielding options.
Design of the shield on a membrane switch depends greatly on your requirements. Termination options can use an electrical termination, aluminum ground tail or by using conductive PSA.