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  2. Perfluoroalkoxy alkane - Wikipedia

    en.wikipedia.org/wiki/Perfluoroalkoxy_alkane

    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 ]

  3. Professional Fraternity Association - Wikipedia

    en.wikipedia.org/wiki/Professional_Fraternity...

    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.

  4. Per- and polyfluoroalkyl substances - Wikipedia

    en.wikipedia.org/wiki/Per-_and_polyfluoroalkyl...

    Skeletal structure of PFOS, an effective, persistent and bioaccumulative fluorosurfactant A physical sample of PFOA, appearing as a white solid as seen here in a relatively pure form. It is commonly referred to as the main harmful PFAS chemical and PFOA is responsible for many of the negative health effects commonly associated with PFAS.

  5. Performic acid - Wikipedia

    en.wikipedia.org/wiki/Performic_acid

    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.

  6. Perfluoroalkyl carboxylic acids - Wikipedia

    en.wikipedia.org/wiki/Perfluoroalkyl_carboxylic...

    Trifluoroacetic acid is a widely employed acid, used for example in the synthesis of peptides.Its esters are useful in analytical chemistry. Longer-chain perfluoroalkyl carboxylic acids, e.g. with five to nine carbons, are useful fluorosurfactants and emulsifiers used in the production of polytetrafluoroethylene (Teflon) and related fluoropolymers.

  7. Today's Wordle Hint, Answer for #1264 on Wednesday, December ...

    www.aol.com/todays-wordle-hint-answer-1264...

    Today's Wordle Answer for #1264 on Wednesday, December 4, 2024. Today's Wordle answer on Wednesday, December 4, 2024, is CRYPT. How'd you do? Next: Catch up on other Wordle answers from this week.

  8. Perfluoroether - Wikipedia

    en.wikipedia.org/wiki/Perfluoroether

    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).

  9. Paraformaldehyde - Wikipedia

    en.wikipedia.org/wiki/Paraformaldehyde

    Paraformaldehyde (PFA) is the smallest polyoxymethylene, the polymerization product of formaldehyde with a typical degree of polymerization of 8–100 units. Paraformaldehyde commonly has a slight odor of formaldehyde due to decomposition.

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