Sodium Sulfate

Sodium sulfate — also known as sodium sulphate, sulfate of soda, or CAS No. 7757-82-6 — is an inorganic compound of sodium. This sodium salt form of sulfuric acid is extensively used in a wide range of industries. More than 6.5 million tons of sodium sulfate are produced each year around the world. Most are mined from the compound's natural mineral form called mirabilite, which is taken from lake beds as part of the water treatment process. Another one-third is produced as a byproduct of other processes in the chemical industry.


Molar Weight142.04 g/mol
Melting Point884 °C
Boiling Point1,429 °C
Density2.664 g/cc
FormsWhite, Granules, Crystalline

Uses and Applications

Key applications

  • Hair care
  • Ceramics
  • Glass
  • Pulp and paper
  • Textile handling
  • Detergent


  • Cleaning
  • Water Treatment
  • Food

Synonyms: Sodium sulphate, Sulfate of sodium, Thenardite (mineral), Glauber's salt (decahydrate), Sal mirabilis (decahydrate), Mirabilite (decahydrate mineral), Disodium sulfate, Disodium Sulfate, Na2SO4, Salt Cake, Sodium Sulfate

Chemical Formula: Na2SO4

CAS Number: 7757-82-6