... -6mm,10-120mesh etc uses: construction,insulation,fireproof,horticulture,filler Expanded PerliteSize: 1-3mm,1-6mm,3-5mm,2-4mm 20 ... Chemical Content:SiO268-76%Al2O311-16%Na2O4-5% Applications Because expanded perlite is good heat insulation, light weight, nontoxic, porous, and ... *soil adjusting agent, non-soil growing substrate, pesticide cleansing agent Expanded Perlite