... , 16-32mesh, 20-40mesh, 30mesh- Mineral perlite (Chemicals)Light Aggregates:In order to reduce its weight or to increase its insulation ... and fire resistance, perlite is often used as an aggregate in concrete, Portland cement, asphalt or gypsum plaster. Fillers:Easy to ... . On a much different scale, it is also used in plastics and in oil, water or geothermal wells. SiO2 73-74AI2O3 12-15Fe2O3 ...