Apparent density 1.2 (kg / m3) bulk density of 1.2 (kg / m3) 0.1 clay content (%) 0 mud content (%) 0.1 moisture content (%) 7.5 robustness index (%) Color White Origin lingshou brand Lin series with coarse sand is a natural stone in its natural state, the force of the water for a long time repeatedly collide, friction, and its composition is more complex, there is a certain surface smoothness, impurity content and nonmetallic minerals. River sand particles sleek, relatively clean, wide source; no taste of river sand, sea sand salt taste; sand for the construction industry has Zhuo contribution. But the sand on the contrary, often mixed with sand and salt shells, most of the sand containing an excess of chloride ions, which can corrode steel reinforced concrete, resulting in damage to the building structure, to a certain extent, will shorten the safe use of the building lifetime.