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The melting point of anhydrous sodium sulfate (sometimes referred to as Glauber’s salt, anhydrous mirabilite or anhydrous Glauber’s salt) is 884°C. It is a white orthorhombic double cone crystal or fine powder that is odorless and has a cold feeling. It is soluble in water and glycerol, insoluble in ethanol. It is easy to absorb moisture in humid air and becomes hydrated and then dissolves easily when exposed to hot water or steam.

Sodium sulfate is an important industrial and commercial compound that is used as a drying agent in the manufacture of glass, paper and textile products, as a buffering and stabilizing agent in dyeing and finishing textiles, in the production of detergents and cleaning products, and as a food additive and laxative. It is also a critical ingredient in gold electroplating, and has been found to be superior to certain other reagents for dissolving finely electroplated micrometre gold used in electronic hardware such as pins and connectors.

Sodium sulfate can be safely handled in a well-ventilated area when in dry form, but it has the potential to cause skin and eye irritation if in contact with the skin or eyes. It may irritate lungs if inhaled. Ingestion in large amounts can lead to dehydration, electrolyte imbalances, gastrointestinal distress and allergic reactions. This is a very common and useful compound, and it is important to use it properly. For more information about this chemical, please visit the HSDB record page for Sodium Sulfate, Anhydrous.