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         1.Graphic overlay Typically, polyester is the material used due to its superior chemical resistance and flex life compared to polycarbonate.

2. Overlay adhesive – The adhesive layer, typically created with an acrylic adhesive, bonds the graphic overlay to the top circuit layer.

3. Top circuit layer – This is a 0.005” – 0.007” heat stabilized polyester printed with silver conductive inks.

4. Circuit spacer – This layer separates the top circuit from the bottom circuit so the switch remains open until the keypad is pressed. The circuit spacer is a polyester spacer with adhesive on both sides.

5. Lower circuit layer – This is a 0.005” – 0.007” heat stabilized polyester printed with silver conductive inks. This layer terminates a flexible tail that acts as the interconnect to controller PCBs or other electronics.

6. Rear adhesive layer – This adhesive layer bonds the entire membrane switch package to the product enclosure or housing, or to a rigid support panel.

7. Rigid support layer– This optional layer adds structural integrity to the membrane switch assembly.

If you need more imformation about construction of membrane switch, Please contact me at gsxingan@163.cm.