Physical and chemical properties: white monoclinic crystal or powder.The relative density is 2.68.Melting point is 884 oC.Soluble in water, aqueous solution is alkaline.Soluble in glycerin, insoluble in ethanol.Exposure to air is easily hygroscopic and becomes aqueous sodium sulfate.Converted to hexagonal crystallization at 241oC.High purity, fine particles of anhydrous matter known as sodium sulfate.
Use, used in the manufacture of sodium sulfide, sodium silicate, also used in papermaking, glass, printing and dyeing, synthetic fiber, leather and other industries.