... ,Anhydrous Zinc Borate Granular Size: 3um-7 um as flame retardant Flame Retardant Zinc BorateSpecification:Item/Grade Zinc borate 2335( 2ZnO.B2O3 ... 40.0B2O3 , % 45.0-48.0Loss on ignition,% 13.5-15.5Fineness (Residue on 45um sieve ), % ≤ 0.1Specific gravity, g ... , wall paper, carpet, paint etc decorative materials to improve flame retardant performance. 3. Base on its chemical properties, Zinc borate is ...