High quality ptfe membrane filter 0.2 um for metals PTFE membrane filters, 47mm diameter | Sigma-Aldrich Find PTFE membrane filters, 47mm diameter and related products for scientific research at MilliporeSigma Product Number Product Description SDS SLFG050 A 50 mm diameter non-sterile syringe filter with a 0.2 µm pore size hydrophobic PTFE