PFAs Show Improved Crack Resistance, Purity.Two ultra-high-purity (UHP UHP Université Henri Poincaré (French: Henri Poincaré University) UHP Ultra-High Performance (projector lamps) UHP Ultra High Pressure (waterjet) UHP Utah Highway Patrol ) grades of PFA PFA Pacific Film Archive PFA Professional Footballers Association PFA Paraformaldehyde PFA Predictive Failure Analysis PFA Perfluoroalkoxy PFA Protection From Abuse PFA Parent-Faculty Association PFA Popular Flying Association fluoropolymer A fluoropolymer is a polymer that contains atoms of fluorine. It is characterized by a high resistance to solvents, acids, and bases. Fluoropolymers were discovered serendipitously in 1938 by Dr. Roy J. Plunkett. have been launched by Dyneon Fluoropolymers in Oakdale, Minn. They are made using a special water-purification process to reduce extractable ion levels and make the resins better suited to a semiconductor manufacturing environment. The new UHP grades, PFA-Flex X8502 for extrusion and 8515 for injection molding, are also said to be more resistant to environmental stress cracking (ESCR ESCR Economic, Social, and Cultural Rights ESCR embryonic stem cell research ESCR Environmental Stress Cracking Resistance ESCR Electronic Social Care Records (UK) ESCR European Society of Cardiac Radiology ESCR Elementary Stream Clock Reference ) than conventional PFAs. This responds to growing concern over use of new wetting agents in semiconductor processing, which can cause stress-cracking of PFA piping, tubing, pumps, valves, equipment windows, and wafer carriers. Dyneon says the new materials also provide smoother part surfaces, greater flexibility, and higher clarity. |
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