Main ingredients of sandstone 1.Quartz>65% 2.Clucnch=10% 3.Iron ore=13% 4.other>10% physical specification: 1.Density:2200-2500/kg/m2 2.Resist pressure:47-140mpa 3.Absorbaility of water<10% This sandstone with moitureproof,skidproof,ventilate,decalescence,keep heating etc.
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