10 Packs(Min. Order) 0.22 Micron Disc Membrane Filter millipore PTFE Membrane Filter. $1.00 - $35.00/Pack. 10 Packs(Min. Order) 33mm 47mm 0.22 micron lab Organic system PTFE Membrane Filter for vacuum filtration. $1.00 - $35.00/Pack. 10 Packs(Min. Order) 0.45um Hydrophilic PTFE Membrane Filtration in Laboratory.