... , is the first grade in similar products. It can absorb X-rays,gamma rays and promote density and surface smooth.It ... process.It is good whiteness,high purity.ApplicationIt can absorb X-rays,gamma rays and promote density and surface smooth.It ... :325 Mesh,400 Mesh,600 Mesh,800 Mesh,1250 Mesh,2000 Mesh,3000 Mesh,6000 Mesh,8000 Mesh,12500 Mesh,15000 Mesh ...