... ,gas resistant 3)durable use Features of our flexible circuit:1) Size: as you required2) Thickness: 0.1 mm or customized3) ... overlay mostly use PC (polycarbonate) or PVC material and the circuit layer commonly use PET (polyester) material2) Rear adhesive: 3M, ... Also can provide the membrane switches with special requirements, such as Shielding, Windows/Lens Coating, Embossing, Embedded LEDs, UV glossy ...