First distinguish whether the material is new or recycled. The recycled material is yellowish, the blade surface is rough, and the thin slices are visually flowery. Many materials on the market are made of recycled materials, and manufacturers are directly required to agree on new materials. Depending on the use environment, normal white pure PTFE materials generally have a high temperature of 150 degrees in the valve industry, and 260 degrees in the insulation industry. The filled PTFE materials generally have a temperature resistance of close to 280 degrees. Of course, chemical substances and pressure will affect Operating temperature.