Sodium Thiosulphate Pentahydrate

EP, USP (Tested for Endotoxin & Microbes)

CAS #:


Molecular Formula:

Na2S2O3 . 5H2O


Disodium Thiosulfate, Sodium Hyposulfite pentahydrate

Molecular Weight:

248.18 g/mol


Sodium Thiosulfate, Pentahydrate has been used to lessen some of the side effects of cisplatin (a cancer medicine). It is also used with another medicine in the emergency treatment of cyanide poisoning. In analytical chemistry, the most important use comes because the thiosulfate anion reacts stoichiometrically with iodine in aqueous solutions.

Characters Unit Specification
Appearance transparent, colourless crystals
Assay % 99.0 – 101.0
Identification complies
Appearance of solution clear and colourless
pH-value 6.0 – 8.4
Sulphates and sulphites % max. 0.2
Sulphides complies
Heavy metals ppm max. 10
Total aerobic microbial count cfu/g max. 100
Total yeasts and moulds count cfu/g max. 50
E.coli cfu/g absent in 1g
Pseudomonas aeruginosa cfu/g absent in 1g
Staphylococcus aureus cfu/g absent in 1g
Salmonella cfu/g absent in 25g
Bacterial endotoxine IU/g max. 2.5
Water % 32 - 37
Calcium complies

Shelf Life/Retest Date: Sodium Thiosulphate Pentahydrate can be kept for at least 2 years if stored under recommended conditions.

Storage/Shipping Conditions:

  • Keep container tightly closed in a dry and well-ventilated place.
  • Store at room temperature in the original container.
  • Hygroscopic. Protect from moisture.
  • Store away from incompatible materials.

Pack Sizes: 1 Kg

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