Copper Flex Membrane Switches：A flexible printed circuit is a vast accumulation of conductors bonded to a thin dielectric, or insulating film. In a flexible printed circuit, a very thin sheet of copper push the button is first laminated to the push the button flexible film substrate then chemically etched away, leaving copper traces.Membrane switch is an push the button for turning a flexible printed circuit on and off. It differs from a mechanical switch, which is usually made of copper and plastic parts: a membrane switch is a circuit printed on PET or ITO. The ink used for screen printing is usually copper / silver / graphite filled and therefore conductive. The etching process is not as environmentally friendly and more expensive than screen-printing silver traces.