caustic soda with good quality CAS No.1310-73-2Physicochemical PropertiesColorless, transparent crystals, melting point :318.4,boiling point:1390, crispy. Pure solid caustic soda appear white, block ,flake, bead , easily soluble in water ,can release lots of heat. in water appear alkaline, feeling creamy. soluble in ethanol and glycerol, not soluble in acetone ,ether. strong corrosive, corrupt ...