The structure of the rock slab is dense, the surface is smooth wear-resisting, the roughness value is small, the rock is long natural aging, the internal stress completely disappears, the material is stable, will not deform, acid, alkali, corrosion resistance, magnetic resistance; coefficient small, affected by the temperature of small, face collision or scratches, will only produce pits, do not produce convex lines, burrs, no impact on the accuracy of the measurement, rock slab main disadvantage is, can not withstand the impact of too big, beat, high humidity will be deformed, moisture absorption of 1%.
