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Teflon™ PFA HP Plus

Chemours in the Semicon Manufacturing Industry

Environmental stress cracking mechanism
This type of failure is seldom encountered in Teflon™ polymers because the first step in the mechanism is to wet the polymer. Few materials wet Teflon™, but fluorosurfactants do.

These wetting agents can penetrate the solid polymer structure between the spherulites at the surface and weaken these regions. Simultaneously applied mechanical stress then can break the polymer internal structure. With continued exposure and mechanical stress the separation can continue through the polymer, crazing or cracking the component.

Environmental stress cracking mechanism:

  • caused by a small group of very powerful wetting agents
  • this group includes Fluorosurfactants
  • the wetting agent penetrates between the polymer spherulites—allowing molecular mobility
  • mechanical stress can then cause component crazing or cracking

Fluorosurfactant resistance
This data shows the greatly increased resistance of PFA HP Plus to environmental stress cracking. The tests were carried out by Entegris.

Shipley 701, containing fluorosurfactant was enclosed in samples of extruded tubing at 100 times the normal use concentration, at room temperature.

No effect was observed on the PFA HP Plus sample after 17 months of exposure! The test was then discontinued.

Cyclic testing of molded components

These data on the cyclic testing of molded components was also provided to us by Entegris. The molded components are elbows, produced in a test mold designed to produce parts that will fail in a reasonable time—thus allowing the manufacture of test pieces.

The elbows were filled with the fluids and were flexed in cycles: up to three times the rated pressure and then down to normal pressure. The tests are continuing. This data confirms the laboratory test results for Teflon™ PFA HP Plus: the increase in part life in dynamic applications and the outstanding resistance to stress cracking from fluorosurfactants.

The elbows were filled with the fluids and were flexed in cycles: up to three times the rated pressure and then down to normal pressure. The tests are continuing.

This data confirms the laboratory test results for Teflon™ PFA HP Plus: the increase in part life in dynamic applications and the outstanding resistance to stress cracking from fluorosurfactants.

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