Nov 16, 2021 · Nov 01, 2021 · 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.