... PP or PE . 2.Thickness from 1.6, 1.8mm, 2mm. 3.Air permeability from 0.03, 0.2, ... 0.3, 0.6, 1.0 to 2.7 m3/m2/min. CE Woven Filter ... PE fiber. Features is Acid and Alkali resistance. Thickness from 1.6, 1.8mm, 2mm.Air permeability from 0.03, 0.2 ... , 0.3, 0.6, 1.0 to 2.7 m3/m2/min.Reinforced Edge.Could ...