CAS number : 7772-98-7
EINECS EC code number: 231-867-5
Molecular Weight: 158
Chemical Formula: Na2S2O3
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DESCRIPTIONSodium Thiosulphate Anhydrous Grade
|Assay as (Na2)S2O3||98 % Min.|
|10% solution in water||Clear|
|Description||White powder free from foreign particles.|
|pH of 10 % Solution||6.5 To 8.5|
|Sufites & Sulfates||0.5% maximum|
|Iron||Less than 10 ppm|
|Heavy Metals||Less than 10 ppm|
|Standard Packing||25 Kg. / 50 Kg/55lbs. HDPE Bag with extra liner inside or in Jumbo bags or as required by the buyer.|
We can give both the grades Pentahydrate and Anhydrous. We can give the technical grade small crystals and large crystals too.
Specifications of Sodium Thiosulfate Anhydrous surpassing BP Ph Eur USP and Reagent Grade Standards:
Description: It appears as white powder free from foreign particles.
Solubility 10% aqueous solution: Freely soluble in water.
(A)Reaction of Sodium
(B)Reaction of Thiosulphate
A solution responds to the test for Sodium and for Thiosulphate
Insoluble Matter: Not more than 0.25%
Calcium: Prescribed Test. No turbidity is produced.
pH: 6 to 8.4
Sulphites and Sulphates: Maximum 0.5%
Heavy Metals: Maximum 0.001%
Sodium Sulphite: Maximum 0.5%
Iron as Fe: Not more than 0.001%
Residual Solvent: To meet the requirement
Assay: Not less than 99% and not more than 100.5% of Na2S2O3 on anhydrous basis.
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