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The basic properties of polytetrafluoroethylene
Mar 29, 2017

1, chemical properties

Resistance to atmospheric aging: radiation resistance and low permeability: long-term exposure to the atmosphere, the surface and performance remain unchanged.

Noncombustibility: Limited oxygen limit below 90.

Acid and alkali resistance: insoluble in strong acid, alkali and organic solvents.

Antioxidant: Strong corrosion of strong oxidants.

2, the physical properties

(1) mechanical properties

Its friction coefficient is very small, only 1/5 of polyethylene, which is an important feature of the perfluorocarbon surface. And because the fluorine - carbon chain between the molecular force is very low, so polytetrafluoroethylene has a non - stick. Polytetrafluoroethylene in the -196 ~ 260 ℃ wide temperature range to maintain excellent mechanical properties, perfluorocarbon polymer is one of the characteristics of the low temperature does not brittle.

(2) resistance to chemical corrosion and weather resistance

In addition to molten alkali metal, polytetrafluoroethylene is almost free from any chemical corrosion. For example, in concentrated sulfuric acid, nitric acid, hydrochloric acid, and even boiled in aqua regia, its weight and performance are no change, almost insoluble in all solvents, only 300 ℃ or more slightly soluble in the whole alkane. Polytetrafluoroethylene does not absorb moisture, non-combustible, oxygen, UV are very stable, so it has excellent weather resistance.

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