... Standard: GB209-2006 4. Dangerous Class: 8.1 Caustic Soda Flakes 99% Molecular Formula: NAOHMolecular Weight: 40.01CAS NO.: 1310 ... 0.15%Fe2O3 % ≤0.005%Application: The use of sodium hydroxide and alkaline desiccant, paper, aluminum smelting, refining tungsten, rayon and ... as inorganic salt production, preparation of borax, chromium salt, potassium permanganate, phosphate, etc., but also the use of many ...