... .A.S. No.: 1310-73-2Trade Name: Caustic Soda, Dry, Solid, FlakeSynonyms: Caustic Soda, Dry, Sodium Hydroxide, Flake NaOHChemical Formula: NAOHChemical Family ... %Fe2O3 ≤ 0.005% 0.004%QUANTITY/WEIGHT DECLRED OK caustic soda sodium hydroxide flakes 99%