... packing. They have the quality of low-pressure drop, increased operating elasticity, minimum amplifying effect, and maximum liquid treatment compared ... resistance(wt%)≥99.5Loss in burn(wt%)≤5.0Max. operating Temp.(Degree C)800Crush strength(Mpa)≥130Mohs Hardness(Scale)≥7 Geometric ... as for purifying the air in chemical plants.4) Operating in vacuum conditions at a bottom absolute pressure of 100pa ...