Polytetrafluoroethylene (TFE or PTFE), referred to as F-4, is an engineering plastic that has the characteristics of various other engineering plastics. Its wide frequency range, high and low temperature range, excellent chemical stability, and high electricity. Insulation, outstanding surface non-stickiness, good lubricity and weathering resistance make PTFE belong to other plastics in the related technologies of various industrial sectors.
Electrical insulation properties: PTFE has excellent electrical insulation properties. The insulation resistance is very high, its volume resistivity is generally greater than 1015 Ω & # 8226; m, the surface resistivity is greater than 1016 Ω, even if it is immersed in water for a long time, the change is not significant, and it does not change greatly with temperature. Teflon breakdown field strength is very high, very thin PTFE film, its breakdown field strength can reach 200KV / mm; but as the thickness increases, the breakdown field strength gradually decreases, the temperature changes against the impact The impact of the field is not strong. PTFE is extremely stable to arcing and is generally resistant to arcing for more than 300 s. This is because when discharging on a high-pressure surface, it does not cause a short circuit due to charring, and only decomposes into a gas. Even in the long-term open-air exposure, it is not affected by the dust and rain.
Thermal properties: PTFE has a relatively high heat resistance and low temperature resistance. It can be used at -60 ° C ~ +260 ° C with PTFE insulated wire.
Chemical resistance: Excellent chemical resistance. It is not attacked by strong corrosive chemicals and does not have any effect on it; it is also completely free of aqua regia, hydrofluoric acid, concentrated sulfuric acid, chlorosulfonic acid, hot concentrated sulfuric acid, boiling caustic soda solution, chlorine gas. And the role of hydrogen peroxide. Even at high temperatures, Teflon maintains good chemical resistance.
Mechanical properties: Due to the small mutual attraction between the polytetrafluoroethylene macromolecules, it has only moderate tensile strength. However, its tensile strength and elongation are in full compliance with the requirements of wire and cable. At high temperatures, the mechanical properties of polytetrafluoroethylene do not change much when the temperature does not exceed 250 °C.
Other properties: It has good moisture resistance and water resistance. The insulation resistance after immersion is basically the same, which is beyond the reach of other materials. Excellent weather resistance.
Due to the above outstanding advantages of PTFE, wires insulated with PTFE are widely used in various types of wiring in aerospace, insulation of coaxial cables, insulation of thermocouple wires and class H F-class motors. Lead lines, etc.
Yangzhou Fengming Cable Factory specializes in manufacturing high temperature resistant wires and PTFE PTFE tape wrapped glass fiber braided wire. No PTFE extrusion line is available. Welcome to consult and purchase.
