Mechanical specification (new sandy) Hardness(mohs): 4 Unit volume weight(gr/cm3): 2, 59 Water absorbtion(volume %): 1, 2 Compressive strength(kgf/cm2): 1200 Strength after freezing(kgf/cm2): 1270 Strength to blow(kgf cm/cm3): 26 Strength to bending(kgf/cm2): 75 Strength to corrosion(cm3/50 cm2): 14, 9 Porosity(%): 2, 9 Chemical analysis (new sandy) Sio2(%):1, 50 Al2o3(%):
