good waterproof , long service life ,high efficiency ,better stiffness, optional serial colors. fuel crepe filter paperItemValueBASIS WEIGHT(g/m2)92THICKNESS(mm)0.38AIR PERMEABLITY(p=200paL/m2.s)≥50CORRUGATED DEPTH(mm)----BURST STRENGTH(Kpa)≥210MAXIMUM PORE SIZE(um)54RESIN CONTENT (%)-----