Minisart ptfe membrane filter 0.22 um for acids PTFE Membrane Filters, 0.22 um, 25mm, Nonsterile, 200 Buy PTFE Membrane Filter,25mm,Hydrophobic,0.22um,200/pk. Fast Shipping and Smart Support Product Specifications Filtration area(cm2) 4.9 Wettability Hydrophobic Maximum operating temperature 130 Degrees C Bubble point (psi) 14.5 Burst pressure