... delivery PerliteType: expanded or non-expandedSize: 0.1-1mm,1-2mm,1-3mm,2-4mm,3-5mm,1-6mm,16-20mesh,14-20mesh,16-32mesh ... -corrosive, neutral pH value (pH value: 6.5-7.5), acid resistant and alkali resistant, light weight, high absorption and insulation ...