... .Sodium Hydroxide 3.NaOH 4.Hazard Class: 8 NaOHcaustic soda pearls and flake 99% 1,Properties:NaOH, Molecular Weight: 40, ... , presenting deliquescence when exposed to air. 2, Specification: (1)Caustic Soda Pearls Items Specification Purity (% ≥ ) 99.0 Sodium Carbonate (% ≤ 0.8 ... -2.0 mm 1.5-3.0 mm (2)Caustic Soda Flakes Items Specification Purity (% ≥ ) 99.0 Sodium Carbonate (% ≤ 0.8 ...