Sodium Thiosulfate Anhydrous

Sodium thiosulfate pentahydrate (Na2S2O3), also spelled Sodium Thiosulphate Pentahydrate, is a colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O3•5H2O.  It is an efflorescent, monoclinic crystalline substance also called Sodium Hyposulphite or “Hypo.”
Sodium thiosulfate or Sodium Thiosulphate is generally used as pentahydrate, in certain applications like photography, pharmaceutical, table salt and some other applications; it is used as anhydrous sodium thiosulfate or Sodium Thiosulphate Anhydrous.

Sodium Thiosulfate Anhydrous


(Na2) S2O3

Molecular Weight


Assay as (Na2) S2O3

98 % Min.

20 % Solubility


PH of 10 % Solution

6.5 To 8.5


White powder free from foreign particles.

Uses: Photographic industry - as solubilized undeveloped silver salts in fixing of films and print.

Other hot product: Sodium Metabisulphite |Sodium Bicarbonate