... -2mm,1-3mm,2-4mm,3-5mm,1-6mm,16-20mesh,14-20mesh,16-32mesh,20-40mesh,30-50mesh,50-150mesh,200 ... absorption and insulation capability. Main Chemical Content: SiO268-76%Al2O311-16%Na2O4-5% Applications Because expanded perlite is good heat insulation ...