WC Code: 19-051

Sodium Thiosulfate Anhydrous

Wintersun code: 19-051
CAS Number: 7772-98-7
Molecular Formula: Na2O3S2
Molecular Weight: 158.11

Sales Specification

Appearance: White powder
Sodium Thiosulfate Anhydrous percent by mass, min: >98.00 % Min
PH of 10% solution: 6.5-9.5 Max
Insoluble in water: <0.01 % Max
Sodium Sulphide % by mass, max: <0.001%
Iron (Fe)percent by mass, max: <0.005% Max
Loss on Drying: 1.5% Max
Bulk Density: 1.667 g/cm3


It is a moderate reducing agent. It is a source of thiosulfate ion (S2O3-2) (dissolves silver salts). Its major use is as a fixing agent in photography for developing film and the extracting silver from ore. It is used in chrome-tanning leather and in chemical manufacture as a source of sulfide ion. It is also used in paper, textile, and water treatment industry and gas purification.


50lb paper bag, 44 bags per pallet


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