... 4.best price 5.anti-acid, anti-alkali PP non-woven filter clothMaterial:polypropyleneFeatures: non-toxic without excitant, moistureproof, anti-acid, anti-alkaliWeight: 200 ... setting, filming PTFE, dipping treatment of water or oil.PP non-woven filter cloth are suitable for agricultural, shoes, leather, mattresses, decoration, chemical ...