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hydrogen peroxide, chloroacetic acid and other basic chemical raw materials.

Sodium thiosulfate

Sodium thiosulfate


Sodium thiosulfate, Sodium sulfite, soda, sea wave, is common sulfate, Chemical formula is Na2S2O3, Molecular weight is 158.108, It is the product of the substitution of an oxygen atom by a sulfur atom in sodium sulfate, so the oxidation numbers of the two sulfur atoms are -2 and +6, respectively.
Sodium thiosulfate is colorless, clear crystal or crystalline fine grain; Odorless, salty taste; It is weathering in dry air and deliquescence in wet air. Easily soluble in water, aqueous solution shows weak alkaline reaction; Reaction with strong acid produces sulfur elemental and sulfur dioxide gas. With the participation of thiocyanase, it can be combined with the cyanide ion free in the body or with methemoglobin to form a non-toxic thiocyanate from the urine and cyanide poisoning. In addition, it can also combine with a variety of metal ions to form non-toxic sulfides discharged from the urine, and also has a desensitization effect. Clinically used for cyanide and nitrile poisoning, arsenic, bismuth, iodine, mercury, lead poisoning treatment, and the treatment of skin pruritus, chronic dermatitis, chronic urticaria, drug rash, scabies, ringworm and so on.

Product name: Sodium thiosulfate
Alias: hypo; hyporice; sodium hyposulfite; sodium subsulfite; sodium thiosulfate anydrous; thiosulfuric acid, disodium salt; thiosulfuric acid (h2s2o3), disodium salt; thiopivalic acid sodium salt; sodi-um hyposulfide; dechlorinating solution; betz 0235; sulfurothioic O,O-acid; hydrogen sulfurothioate
Chemical formula: Na2S2O3
Molecular weight: 158.108
CAS: 7772-98-7
EINECS: 231-867-5
Water solubility: easily soluble in water
Density 1.69 g/cm3
Appearance and Properties: Colorless, transparent crystal or crystalline fine grain
Melting point: 48°C
Boiling point: 100°C
Stability: Stability. Incompatible with strong acids, strong oxidants, iodine, mercury.
Storage condition: 2-8ºC
Safety information
HS code: 2830909000
WGK Germany: 1
Hazard class code: R36/37/38
Safety instructions: S24/25-S23-S36-S26
RTECS: XN6476000
Dangerous goods mark: Xi

Application: Mainly used as fixing agent in photography industry. Secondly, it is used as reducing agent of dichromate in tanning, neutralizing agent of nitrogen tail gas, mordant, bleaching agent of wheat stem and wool, and dechlorination agent for pulp bleaching. It is also used in the manufacture of tetraethyl lead, dye intermediates and ore silver extraction.

Industrial grade: HG/T 2328-92

superior grade
top grade
white monoclinic crystal system
white monoclinic crystal system
sodium thionate (Na2S2O3.5H2O), % ≥
water insolubles, % ≤
sulfide (Na2S), % ≤
ferrum (Fe), % ≤
PH (200g/l solution)

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