The mass production The price is low PET The thin material Overlay Materials: The most commonly used ... good tactility, abrasion resistant, installation and connection convenience. 4. Tightness is good, moisture-proof, dust-proof, waterproof, anti-oil, anti-corrosion ... harmful gases proof, acid and alkali proof, quakeproof. 5. Low cost, high lifespan, membrane switches design and manufacture are using ...