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The Professional Fraternity Association (PFA) is an American association of national, collegiate, professional fraternities and sororities that was formed in 1978.Since PFA groups are discipline-specific, members join while pursuing graduate (law, medicine, etc.) degrees as well as undergraduate (business, engineering, etc.) degrees.
As stated, the local units of the PFA are called "Nests". There were 160 nests in 1979 and 82 in 2016. Regional structures are called "Districts", which must have at least 500 members. The national convention meets quadrennially. Pittsburgh, Pennsylvania has been the headquarters of the group since 1912. [3]
PFA offers high melt strength, stability at high processing temperatures, excellent crack and stress resistance and a low coefficient of friction. [1] Similarly enhanced processing properties are found in fluorinated ethylene propylene (FEP), the copolymer of tetrafluoroethylene and hexafluoropropylene . [ 5 ]
PFA tubing is commonly used to handle aggressive chemicals Nafion is a fluoroether with strongly acidic sulfonic acid substituents Acyclic perfluoroethers are analogues of diethylether , e.g. O(C 2 F 5 ) 2 , such perfluoro(2-ethoxyethane)sulfonic acid (PFEESA).
Performic acid (PFA) is an organic compound with the formula CH 2 O 3. It is an unstable colorless liquid which can be produced by mixing formic acid with hydrogen peroxide . Owing to its oxidizing and disinfecting action, it is used in the chemical, medical and food industries.
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