Whatman® PTFE membrane filters PTFE membrane circles, (TE Whatman® PTFE membrane filters PTFE membrane circles, (TE 35), 0.2 μm, 47 mm, 50/pk; Synonyms: Whatman filter,ptfe filter,Whatman filters; find -Z134201 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich Pall Filter Membrn 0.2UM 47MM PK100 66199 .