... , neutral pH value (pH value: 6.5-7.5), acid resistant and alkali resistant, light weight, high absorption and insulation capability.Main Chemical ... board, partition board, acoustic board, fireproof board.*Insulation materials for industrial furnaces and tubes*filtration agent for beer, drinking, food and ... agent, non-soil growing substrate, pesticide cleansing agent 1-3mm Industrial Mineral Perlite