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Home » News » HPLC Syringe Filter » Iso9001 0.2 micron syringe filter hplc for analysis Wholesales 0.2 um PTFE syringe filter manufacturer-Analytical Ec21 0.2 um ptfe syringe filter for coal Syringe filter 25 mm 0.45 | Sigma-Aldrich Product Number Product Description SDS AG4502550 This is a 25 mm Hydrophilic Pure Silver membrane filter with a 0.45 um ( 0.45 micron filter ) pore size.