Memtrex FE filters are available the following absolute pore size micron ratings: 0.1, 0.2, 0.45 and 1.0 µm. Typical Applications: Aggressive solvents such as alcohols, esters and ketones, Corrosive acids and bases, Vents/exhausts for autoclaves, fermentors, and storage tanks, High purity chemicals and water used in electronics manufacturing.