It is a polymer compound formed by the polymerization of tetrafluoroethylene, whose structure is -[-cf2-cf2-] n-. It has excellent chemical stability and corrosion resistance, and is one of the best materials with corrosion resistance in the world, in addition to the melting of alkali metals, chlorine trifluoride, chlorine pentafluoride and liquid fluorine, it is resistant to all other chemicals and can not be changed when boiling in the royal water. Sealing, high lubrication, non - viscous, electrical insulation and good aging resistance, excellent temperature resistance. Teflon itself is not toxic to humans.

It has solved many problems in the field of chemical, petroleum, pharmaceutical etc.. PTFE seals, gaskets, gasket, PTFE seals, gaskets, gasket PTFE resin molding polymerization is made of suspension.

High temperature - working temperature up to 250℃

Low temperature resistance - with good mechanical toughness; even if the temperature drops to -196℃, can keep 5% elongation.

Corrosion resistance - to most chemicals and solvents, showing inert, strong acid and alkali resistance, water and various organic solvents.

Weather-resistant - has the best aging life in plastics.

High lubrication - lowest friction coefficient of solid materials .

Non adhesion - is the minimum surface tension in a solid material that does not adhere to any material.

Non-toxic - with physiological inertia, as artificial blood vessels and organs long-term implanted in the body without adverse reactions

 Insufficient

1, PTFE With "cold flow". That is, the plastic deformation (creep) of material products under long continuous loading, which brings some limitations to its application. For example, when PTFE is used as a gasket, the bolts are screwed so tightly for a tight seal that when the specified compression stress is exceeded, the gasket will produce a "cold flow" (creep) and be compressed. These shortcomings can be overcome by adding suitable fillers and improving the structure of parts.

2. PTFE has outstanding non-stickiness, which limits its industrial application. It is an excellent anti-stick material, which makes it extremely difficult to bond with the surface of other objects.

3. The linear expansion coefficient of PTFE is 10 to 20 times that of steel, larger than that of most plastics, and its linear expansion coefficient changes irregularly with the change of temperature. When PTFE is applied, if insufficient attention is paid to this aspect of performance, it is easy to cause losses.

PTFE material is due to its characteristics as the valve soft seal ring the most commonly used material, but its shortage also limited its use, so in the application, often according to the actual working condition, using different filling formula (RPTFE) or imported modified PTFE, its formula and imported brand variety, the most widely used.