Venefilter Inc., builds the pleated membrane filter with polytetrafluoroethylene (commonly known as Teflon) providing hydrophobicity and resistance to water intrusion compared with polyvinylidene fluoride and polyethylene membranes. The main virtue of polytetrafluoroethylene is that it is virtually inert, does not react with other chemicals except in very special situations. This is basically due to the protection of the fluorine atoms on the carbon chain. This lack of reactivity makes virtually zero toxicity.FeaturesVFTEF Surface area of 8.5 ft2, single-layer construction that provides higher flow rates and minimizes the size of the filtration system. rates and minimizes the size of the filtration system. 100% washable with water for 18 MW-cm ID and proof of integrity. Meets criteria applicable CFR and USP Class VI biological test for plastics. Made following the cleaning category Cleanroom ISO Class 7. Built with good manufacturing practices. Pore size, and batch no. number printed on each filter for identification and traceability.