... , % 37.0-40.0B2O3 , % 45.0-48.0Loss on ignition,% 13.5-15.5Fineness (Residue on 45um sieve ), % ≤ 0.1Specific gravity, g/cm3 ... flame retardant performance, remove smoke emission and adjust the balance on chemical, mechanical, electrical etc properties 2. As environmental protection substitute ... and dry storehouse, don't to let it be rained on, no mix storage and transportation with acids is allowed. 3 ...