Tisch Brand SF13856 Polytetrafluoroethylene PTFE Membrane Filter, 0.22um, 47mm 1/pk/100 per pack | Wettability: Hydrophobic | Maximum Operating Temperature: 130 Degrees C | Flow Rate: 8 (ml/min@10psi) 3. $9467 ($7.28/Item) Save more with Subscribe & Save. Get it as soon as Wed, Jul 20. FREE Shipping by Amazon.