... membrane have CN-CA, PTFE, GF, Nylon. PES,PVDF , the OD can be 25mm,47mm, 60mm,90mm,120mm,293mm ... About hydrophilic lab membrane filter ... discs:Specification:Material:Removal Rating :0.20µm, 0.45µm,1.20um, 3.00um, 5.00umDiameterMembrane Disc: Φ13 Φ25 Φ47 Φ50 Φ60 ... to absorption.In this case,we usually apply CN-CA membrane,which is more suitable. membrane filter discs