Applications: additive, fireproof wood, snow melt, dust proofing, textiles, steel industry and magnesium metal electrolysis. 1. Magnesium Chloride white flake Material: Seawater Appearance: White flake Molecular formula: MgCl2.6H2O Purity: 98% min. SO4: 0.3% max. Heavy metal (as Pb): 5.0PPM max. Fe: 14PPM max. Ca: 0.08% max. Zn: 2.6PPM max. As: 0.1PPM max. PH value: 8.5