The advantages of membrane switch keypad circuits

1,Traditional Silver Flex membrane switches
The membrane switch requires an electrical path and contact poins to be functional,A screen printed silver filled epoxy ink is typically used in printing membrane keypad.Silver is the most desirable because the resistance is low and the oxide is coneductive. Carbon inks can be used as a substitute for silver when the client is specifications allow for higher resistance.More often the carbon ink is used as an overprint of silver to reduce the chance of silver migration and sulfur attach.
The advantages of silver are: low resistance and good electrical conductivity
The advantages of carbon are: oxidation resistance, abrasion resistance
2,Copper Flex membrane switches
FPC circuit membrane switches can be constructed as:
Single-sided – conductive traces one side copper of the film substrate
Double-sided – conductive traces both sides copper of the film substrate
The advantages of Copper are: low resistance and good electrical conductivity oxidation resistance, abrasion resistance
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