They are produced with PTFE glass fabric by coating woven glass fiber with PTFE (Tefln). Although it is generally divided into two in terms of classification: non-adhesive and self-adhesive, there are many varieties such as the weaving density of the fiber used in weaving, the density of the PTE coated, and the antistatic properties of the coating. The general thickness of the fabrics is 0.13 and 0.25 mm, the width is standard 1 meter, the lengths are in the form of rolls of 50 m for adhesives and 100 m for non-adhesive ones. Self-adhesive fabrics; It is produced by coating one surface of PTFE coated glass fabric with high temperature resistant silicone adhesive.