The main features of polytetrafluoroethylene membranes (PTFE) are hydrophobic character and extraordinary chemical resistance to aggressive all solvents, acids, alkalis, except the phosphoric acid.
Recommended for use in the filtration of pure aggressive solvents, filtration of gases, aerosols, venting work, etc. In the filter if necessary aqueous samples, therefore it is necessary to moisten the membrane with an organic solvent such as ethanol or isopropanol.
Supplied in pores of 0.22, 0.45, 1.2 and 5.0 microns; in diameter and 13, 25, 47, 90, 142 and 293 mm in diameter.

Bubble point with alcohol (minimum value)
0.22 µm 1.0 bar | 100 Kpa
0.45 µm 0.5 bar | 50 Kpa
1.2 µm 0.3 bar | 30 Kpa
5.0 µm - bar | - Kpa
Flow rate with alcohol 25ºC (∆p=0.7 bar) ml/min/cm2 0.22 µm 8
0.45 µm 12
1.2 µm 50
5.0 µm 250
Permeability to air (m3/m2/24 hours) ∆p= 0.1 bar
0.22 µm 0.40
0.45 µm 0.61
1.2 µm 7.04
5.0 µm 8.54
Thickness: 0.190 – 0.250 mm
Membrane material
polytetrafluoroethylene (PTFE)
Diameters: 13, 25, 47, 90, 142 and 293 mm.
Pore sizes: 0.22, 0.45, 1.2 and 5.0 µm
Maximum temperature of use ≤ 130ºC
Extractables with water: No
Sterilization: Using a g radiation, ethylene oxide,
autoclaving at 134ºC
Chemical compatibility: 1– 14 pH
Reaction to water: hydrophobic