Numerical control panel mainly used sand surface of polyester (PET):surface resistance of good character and insoluble in common organicsolvents, alkaline not. With excellent mechanical properties, electricalproperties, rigidity, hardness and thermal plastic plastic maximumstrength and toughness, low water absorption, abrasion resistance,abrasion resistance excellent, high dimension stability. Tensilestrength can comparable with the aluminum film, significantly higherthan the PC, PVC low because the surface is difficult to be processedinto a matte type, and therefore, texture pet more expensive is theproduction of membrane switch circuit the ideal substrate. The suitablefor texture pet higher on the surface or with liquid crystal displaywindow products