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Hydrophilic PTFE Membrane Filtration 13mm/ 25mm/ 47mm/ 50mm/ 90mm Diameter 0.22um/ 0.45um Pore Size Laboratory Filtrations by Allpure Biotechnology FEATURES PM 2.5 membrane filters are made from PTFE material, which are chemically resistant and possess low chemical background interference, allowing the user to carry out sensitive determinations. 1. Good and permanent Hydrophilicity 2. High Flow Rate 3. High filtration efficiency 4. Pure membrane, low dissolution, no shedding 5. Long Service life 6. Good resistance to Chemical and high temperature 7. No need for pre-wetting 8. Dry preservation Qualifications of our factory: * A world class manufacturing facility, Class 10,000 cleanroom * ISO 9001, ISO 13485 certificated, CE certificated * Products quality achieved by Japanese quality control system during production * Cost-effective, state-of-the-art production technology