5 mil backing thickness produced from PTFE impregnated glass fabric that are coated with a "high temperature" silicone adhesive. The PTFE provides a smooth anti-stick surface while the glass fabric provides strength and dimensional stability Backing    : PFTE Glass Cloth          Adhesive Type    :  Silicone          Total Thickness (mil)    :  -          Backing Thickness (mil)    : 5.0 mil          Adhesive Thickness (mil)    : 2.0 mil          Adhesion to Steel (oz/in):     45 oz/in          Tensile Strength (lbs/in)    : 120 lb/in          Dielectric Strength (volts)    : -          Elongation at Break (%)    : 5% PTFE has the highest melting point and is capable of continued service at 500F(260 C). FEP is a melt processible resin capable of continued service at 400F(204 C). PTFE products are used as gasket and packing materials in chemical processing equipment; as electrical insulation for maximum reliabillity; and in bearings, seals, piston rings and other mechanical applications, especially those requiring anti-stick characteristics. PTFE has excellent thermal and electrical insulation properties. And, it has a low coefficient of friction. It is difficult to make anything adhere to PTFE. A material may stick to it, but the material can be peeled off or rubbed off. ​