Sodium Thiosulfate Anhydrous Food Grade [Na2S2O3] [CAS_7772-98-7] 98+% White Powder (50 Lb Bag)

$ 176.00 $ 208.00

Wintersun code: 19-051-002
CAS Number: 7772-98-7
Molecular Formula: Na2O3S2
Molecular Weight: 158.11

Sales Specification

  • Sodium Thiosulphate (by mass)  : 98.00% Min
  • pH of 10% Solution  :6.5 to 9.5
  • Insoluble in water  :0.001% Max
  • Sodium Sulphide  :0.001% Max
  • Iron (Fe)  : 0.005% Max
  • Loss on drying:1.5% Max
  • Bulk Density :1.667 g/cc


    50 lb paper bag


    Sodium Thiosulfate is a white translucent crystals or powder that is common as the pentahydrate form; melting at 48 C; readily soluble in water and oil of turpentine; aqueous solution is slightly alkaline which decompose to sulfate and sulfide in the air. 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. When used in food processing, sodium thiosulfate is a powerful antioxidant, meaning it helps prevent oxidation of food, which can lead to issues with the odor, flavour, and texture of food products. It also acts as a “sequestrant,” meaning that it attracts certain ions that can prevent fat oxidation.

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