... 50Water Permeabilityt/m2h.h1.0-2.5Gas Permeabilitym3/m2h.h1.8-5.0Bending Strength MPa3.5-5.0Compressive Strength MPa12-15Mohs ... substances, etc. It can be also used for filtration of natural gas;filtration of dust water-drop;oil fog of compressed air ... oil field recharge water. Filtering vapour,chlorine,oxygen,coke-oven gas, sulfur trioxide,nitrogen pentoxide,carbon dioxide,methane,hydrogen, acetylene. ...