... the needs of customers into a variety of pearl sand products, the current specifications are :8-12mesh ,12 ... 1) 8-12mesh ,12-18mesh ,18-20mesh pearl sand after expansion can be as insulation, thermal insulation ... in construction.(2) 20-50mesh ,30-50mesh pearl sand by the expansion of steel can be used ... 3) 50-70mesh ,70-90mesh ,90-120mesh pearl sand can be as expansive as the beer, pharmaceutical ...