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PTFE Properties and Applications

 

(A) low coefficient of friction

    Polytetrafluoroethylene (PTFE) material has a low coefficient of friction is well known, in 1949, KV Thomas Souter and PH measuring the coefficient of friction polytetrafluoroethylene (PTFE) material on the machine when BL confirmed: carrying 1 ~ 4 kg, sliding speed of 0.1 to 10 mm, the friction coefficient is polytetrafluoroethylene (PTFE) material is 0.04. In carrying 1360 kg, the friction coefficient of 0.01.

(B) temperature performance

    High temperature stability of polytetrafluoroethylene (PTFE) resin material from strong carbon - fluorine atom, and thus determines the polytetrafluoroethylene (PTFE) resin material into a useful high temperature polymer. Thus polytetrafluoroethylene (PTFE) resin material in the high temperature limit exceeded almost all other thermoplastics and synthetic rubbers retains its properties under constant. At the same time, compared with other polymers, in the pure anti-pressure and high temperature, the melt viscosity of polytetrafluoroethylene (PTFE) resin material is very high. Because of polytetrafluoroethylene (PTFE) resin material with high thermal fission limit and a high melting point and ignition point, polytetrafluoroethylene (PTFE) resin material to high temperature and flame. Within the normal operating temperature range, polytetrafluoroethylene (PTFE) rated temperature limit is 260 ℃, in this case, it is not hot fission. Within viewing range 260-360 ℃, weight loss is quite small, and the losses are due to absorption of a small amount of gas and moisture in the polymerization. Only in case the temperature exceeds 400 ℃, polytetrafluoroethylene (PTFE) resin material thermally fissile only become apparent.

    At low temperatures, polytetrafluoroethylene (PTFE) resin material can maintain good performance. At very low temperatures, it can keep a strong impact resistance. Even at temperatures as low as -196 ℃ when, after the specimen is still carefully manufactured toughness has been demonstrated, polytetrafluoroethylene (PTFE) resin material at temperatures above -268 ℃ still use value, and has more than -80 ℃ high plasticity.

(C) Chemical stability

    As we observed in the same chain molecular structure polytetrafluoroethylene (PTFE) resin material is composed of carbon atoms is completely covered by a fluorine atom. The fluorine atom shell to protect erosion-prone chain of carbon atoms, which makes polytetrafluoroethylene (PTFE) resin material having an exposed not react and resist decomposition unique stability in a solvent and solvent. Polytetrafluoroethylene (PTFE) material almost does not chemically react with any known chemical substances, even at very high temperatures and pressures are also resistant to corrosion corrosive chemicals and solvents. In the normal operating temperature range, such resins will not be dissolved and the expansion of any solvent. This unique stability from strong carbon - carbon bonds and strong carbon - fluorine bond combined within, as well as nearly perfect a fluorine atom to carbon atom backbone chain of high molecular weight protective shell, and polymers, such structure also had some special properties, such as low coefficient of friction and insoluble.

    We continuously test proved up to twenty years in Florida, polytetrafluoroethylene (PTFE) resin material transparent to ultraviolet light, resistant to oxidation and surface dirt, do not fade, do not become brittle. Exposed in the spectral range of infrared to ultraviolet, polytetrafluoroethylene (PTFE) resin material does not change the visual effects.

    Polytetrafluoroethylene (PTFE) resin material is extremely resistant to water. It is completely resistant to water soluble, is an excellent barrier to water penetration, after prolonged immersion in water and still be able to remain stable in water vapor resistance test United States, France and the former Soviet Union and other countries, the polytetrafluoroethylene ( PTFE) resin material is better than almost any known anti-vapor permeable plastic material. Polytetrafluoroethylene (PTFE) resin material than most polymers have much lower gas permeability. Since the polytetrafluoroethylene (PTFE) resin material has very low permeability, it is widely used in the chemical industry excellent barrier resin.

(D) Electrical Properties

    As early as 1946, people will know that because of polytetrafluoroethylene (PTFE) without electrodes, making it an ideal insulator, or referred to a non-conductive. Excellent insulation properties, together with its mechanical strength, chemical and thermal stability of polytetrafluoroethylene (PTFE) has become a universal electrical insulator. Since the polytetrafluoroethylene (PTFE) resin does not absorb water, it was immersed in water for a long time does not change its electrical impedance capability.

(E) fiber properties

    Polytetrafluoroethylene (PTFE) fibers and polytetrafluoroethylene (PTFE) chemical resistance properties, low friction coefficient, a unique high anti-wear properties and high strength combine to produce a tough, durable fiber structure. Highly porous fibrous structure as GT triangular cloth, the film can be used in a variety of applications, it has been developed, which is the use of the dispersion of polytetrafluoroethylene (PTFE) resin is a unique capability of the original fiber.

(F) the safety and reliability

    Fifty years, thousands of tons of polytetrafluoroethylene (PTFE) have been produced and applied in a variety of potentially dangerous environments, including many beyond the rated temperature applications. There is no relevant operating polytetrafluoroethylene disease and death and casualties (PTFE) aspect caused.

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