Sodium Thiosulphate IP

Sodium Thiosulphate also known as sodium hyposulphite is an efflorescent crystalline substance that dissolves readily in water. It occurs in anhydrous and pentahydrate forms.


It is used as a photographic fixer for both film and photographic paper processing. It is also used as a neutralizing bleach to dechlorinate tap water, as a component in hand warmers and other chemical heating pads, in the tanning of leather, in pharmaceutical preparations as an anionic surfactant and as an antidote to cyanide poisoning.


Chemical Name: Sodium Thiosulphate
Synonyms: Sodium Hyposulphite
Mol. Formula: Na2S2O3.5H2O
Mol. Weight: 248.19 g/mol
CAS No.: 10102-17-7


General Specifications

Test Specification…IP
Appearance Colorless large crystals or a coarse, crystalline powder; odorless; deliquescent in moist air and effloresces in dry air at temperature above 330. It dissolves in its water of crystallization at about 490.
Solubility Very soluble in water, practically insoluble in ethanol (96%). It is soluble in its water of crystallization at about 490C
Appearance of solution The solution is clear and colorless
pH 6.0 to 8.4
Arsenic Maximum 2ppm
Heavy metals Maximum 20ppm
Chlorides Maximum 200ppm
Sulphides Passes test
Sulphates and sulphites Maximum 0.2%
Assay Not less than 99% and not more than 101%


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


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We observe WHO Good manufacturing practice and Good laboratory practice.

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