The thickness of the plastic substrate is 0.25mm or less, which is called the membrane. To indicate the corresponding key position of the operation area, printed on the back of various indicating patterns and characters. Panel layer mainly used as Membrane Switch. According to the size of the panel and Button, the driving force increases, the material is thicker, and the reaction is slower; Material is too thin, feel poor, rebound is not obvious. The thickness above 0.25mm is called sheet metal. Not suitable for stereoscopic bonding. Can be used as a dashboard for buttonless operation area. It can also be used as a liner
for Membrane Keypad to improve their hardness.
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