Modern PTFE membrane based HEPA/ULPA filters for improved energy savings and risk reduction Marc Schmidt, Ph.D. AAF International Heppenheim (Germany) [email protected]+49 175 18 788 78 Belgian Cleanroom Workgroup (BCW) – Cleanroom College Day 2019 Ghent (Belgium) Mar 21, 2019
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Modern PTFE membrane based HEPA/ULPA filters for improved ...bcw.be/assets/modern-ptfe-membrane-based-hepa-ulpa... · • Dr.Roy Plunkett (1910-1994) accidentlydiscovered PTFE on
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Modern PTFE membrane based HEPA/ULPA filters for improved energy savings and risk reduction
• 245 Subsidiaries• 218 International• 27 in Japan
Glass Fiber Media
First developed in the 1940’s.
Glass fiber in use 75+ Years.
Slurry of glass fibers in water with binder.
Poured on a moving screen conveyor.
Water vacuumed from below.
Baked dry in an oven.
Pleated into packs.
Potted in urethane in filter frames.
Industry ‘standard’ for high efficiency filtration due to it’s fine fiber diameter.
Media is extremely fragile!
Media is delicate and vulnerable at every stage of manufacturing, filter installation and testing!
Discovery
• Dr. Roy Plunkett (1910-1994) accidently discovered PTFE on April 6, 1938 at company DuPont.
• He had been looking for better coolant agent.
• Leaving a batch of tetrafluoroethylene (TFE) gas in a pressure container overnight, he found the next day a layer of a white translucent waxy solid, polymerized TFE: Polytetrafluoroethylene (PTFE)!
• Polytetrafluoroethylene was abbreviated to Teflon as registered as trademark in 1945.
source: www.worldofchemicals.com
Structure
• Fluorine saturated carbon chain (C2F4)n.
• Long chains with high molecular weight.
• Strong fluoro-carbon bonding.
• Fluorine atoms surround central ethylene carbon chain completlyprotecting it.