1. made of die cutting the metal-strengthening expansion graphite slab and can be processed to be internal wrapped border and external wrapped border. The general thickness is 1.5mm, 3.0mm, 2.0mm, 4.0mm . operation temperature: wrapped PTFE: 200--200℃. Carbons Steel: 10--450℃ SS304: -240--560℃ SS316: -200--870℃ 2. Application: has very good sealing performance, low preloaded pressure, and not sticking to the flange sealing surface; used in the flange surface sealing of pipeline, valve, pump, pressure containers, heat exchanger, and reaction cauldron, etc. The film sticking PTEE can be used in food, pure water, and pharmacy sections.