Brand: Caustic Soda 98% 1, Industrial Grade, solid, pearl and flake Scientific name: Sodium Hydroxide Chemical formula: Na-OH Melting point: 1390 C Density: 2.13 The molecular weight of caustic soda: 01/40 The melting point of interest: 12 C Spot boiling point: 140 C Relative density of percolation: 53.1% (50% solution), 2 at 5.5 C (solution 73% -70%) Peroxide solubility in water: 109 g / 100 ml at 20 C Highly soluble in water, alcohol, glycerin, and methanol