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GY-Sodium Thiosulfate

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CAS No.:

7772-98-7

Grade:

Industrial Grade

Content:

99%

Packaging:

25kg/woven bag

Price valid (until):

2026-09-19

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Chongqing Guangyi Chemical Co.,Ltd

Company Type:

Trader

Location:

China

Payment Terms:

L/C,TT against B/L draft before shipment,100% TT in advance

Qualification:

Main Products:

DMF,Aniline,Benzene,Phosphoric acid,Hexane,Heptane

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Description

Product Detail

Chemical Name： Sodium Thiosulfate

Synonyms ： Sodium hyposulfite anhydrous, Hypo

CAS N o： 7772-98-7

Primary Use ： Photographic fixing, water dechlorination, textile antichlor, leather tanning, gold extraction, iodometric titration, cyanide antidote

Items	Specifications
Appearance	White crystalline powder or colorless monoclinic crystals, odorless
MW	158.11 g/mol
Melting Point	~48 °C (decomposes); some sources report decomposition on heating, no distinct mp
BP / Decomp.	Decomposes on heating (does not boil)
Density (20 °C)	1.667 g/cm³
Solubility (H₂O)	Very soluble; ~70 g/100 mL at 20 °C (literature)
in EtOH	Insoluble
pH (5% aq.)	6.0 – 8.5（ near neutral-basic）
Crystal Structure	Monoclinic
Hygroscopicity	Deliquescent, absorbs moisture in air
Na₂S₂O₃ assay（dry basis）	≥ 98.5%
Loss on drying (105°C, 2h)	≤ 0.5%
Insoluble matter	≤ 0.05%
Sulphate & sulphite (as SO₄)	≤ 0.5%
Chloride (as Cl)	≤ 0.01%
Iron (as Fe)	≤ 0.004%
Heavy metals (as Pb)	≤ 0.002%
Sulfide (as S)	≤ 0.001%
pH（5% , 20°C）	6.0 – 8.5

ECHEMI Editorial Reference

It is colorless monoclinic crystal or white crystalline powder, Odorless, salty ignorant. The relative density is 1.667. Soluble in water, the solubility is 231 g/100 ml of water at 100 ℃. Insoluble in alcohol. deliquescence easily in air. With a strong reductibility, decomposition in acidic solution. Sodium thiosulfate, Na2S203·5H20, also known as sodium hyposulfite, hypo,andsodium subsulfite, is a white crystalline solid that has a melting point of 48 °C(118 °F). Water soluble,it is used as
DryPowder; DryPowder, Liquid; DryPowder, PelletsLargeCrystals; GasVapor; Liquid; OtherSolid; PelletsLargeCrystals|COLOURLESS CRYSTALS.
Sodium thiosulfate is an inorganic sodium salt composed of sodium and thiosulfate ions in a 2:1 ratio. It has a role as an antidote to cyanide poisoning, a nephroprotective agent and an antifungal drug. It contains a thiosulfate(2-).

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Basic Info

Product Name:

Sodium thiosulfate

Other Name:

Thiosulfuric acid (H2S2O3),sodium salt (1:2);Thiosulfuric acid,disodium salt;Thiosulfuric acid (H2S2O3),disodium salt;Disodium thiosulfate;Hypo;Sodium thiosulfate;Sodium thiosulfate anhydrous;Sodium thiosulfate (Na2(S2O3));Sodium oxide sulfide (Na2S2O3);Sodium thiosulphate;S-Hydril;Sodium hyposulfite;Sodothiol;Declor-It;Chlorine Control;Chlorine Cure;Disodium thiosulphate;Desilube 88;Sulfactol;Ametox;Antichlor;Sulfothiorine;MFS 50;13773-27-8;220945-47-1;1374442-73-5;2554533-79-6;2585669-88-9

CAS No.:

7772-98-7

Molecular Formula:

H2O3S2.2Na

InChIKeys:

InChIKey=UWUDCDBGGWPQHS-UHFFFAOYSA-N

Molecular Weight:

158.097

Exact Mass:

157.908417

EC Number:

231-867-5

UNII:

L0IYT1O31N

ICSC Number:

1138

DSSTox ID:

DTXSID9042417

Color/Form:

POWDER|COLORLESS MONOCLINIC CRYSTALS

HScode:

28323000

Categories:

Inorganic Salts

Characteristics

PSA:

104

XLogP3:

-4.35 (calculated)

Appearance:

colourless crystals or white powder

Density:

1.667 g/cm³

Melting Point:

48 °C

Boiling Point:

100°C

Refractive Index:

INDEX OF REFRACTION: 1.489 ALPHA, 1.508 BETA, 1.536 GAMMA; OPTIC SIGN +

Water Solubility:

Solubility in water, g/100ml at 20°C: 20.9

Storage Conditions:

2-8ºC

Vapor Pressure:

Vapour pressure at 20°C: negligible

Toxicity:

Non-toxic

Explosive limit:

WHEN SODIUM NITRITE & THIOSULFATE MIXT WAS HEATED TO EVAPORATE TO DRYNESS, VIOLENT EXPLOSION OCCURRED.

See More Sodium thiosulfate Properties 

Hazard Identification

Classification of the substance or mixture

Not classified.

GHS label elements, including precautionary statements

Precautionary statement(s)
Pictogram(s)	No symbol.
Signal word	No signal word
Hazard statement(s)	none
Prevention	none
Response	none
Storage	none
Disposal	none

Other hazards which do not result in classification

no data available

Handling and Storage

Precautions for safe handling

NO contact with oxidizing agents. Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.

Conditions for safe storage, including any incompatibilities

Separated from strong oxidants.

See More Sodium thiosulfate Safety Data Sheet 

Seller Information

Business Type:
Trader

Main Products:
DMF,Aniline,Benzene,Phosphoric acid,Hexane,Heptane

Location:
No.19-10 Building 10, No.9 Huoju Rd, Jiulongpo District, Chongqing.

Payment Terms:
L/C,TT against B/L draft before shipment,100% TT in advance

Total Employees:
5-10

Year of Establishment:
2012

Company Certificates
- EMS CERTIFICATION OF REGISTRATION
- OHSMS CERTIFICATION OF REGISTRATION
- QMS CERTIFICATION OF REGISTRATION
Chongqing Guangyi Chemical Co., Ltd. is a professional supplier with in-depth engagement in domestic and global chemical trading markets.

Chongqing Guangyi Chemical

Inquiry History

17 Inquiries

Country	Product	Purchase Quantity	Date Posted
Ecuador	Sodium Thiosulfate	250 KG	Feb 2, 2026
Egypt	Sodium Thiossulfate Anhydrous	25 KG	Jan 21, 2026
India	Sodium Thiosulphate	2 TON	Nov 22, 2024
Nigeria	Sodium thiosulfate	500 G	Jun 14, 2024
Singapore	Powder Sodium thiosulphate	1.00 20' Fcl	Jun 6, 2024
Singapore	Sodium thiosulphate	1 20' Fcl	Jun 6, 2024
India	Sodium thiosulfate	1500 KG	May 10, 2024
India	SODIUM HYPO SULPHITE	1.00 20' Fcl	Jan 5, 2024
United Arab Emirates	Sodium Thiosulphate	1.00 KG	Nov 7, 2025
India	sodium thiosulphate	3000.00 KG	Apr 25, 2025
India	Sodium Thiosulfate	100 MT	Mar 27, 2025
Malaysia	Sodium thiosulfate	1 MT	Feb 5, 2025
Russia	Collector for copper, copper-gold, and polymetallic sulfide ores	2 KG	Feb 9, 2026
Russia	Collector for copper sulfides and copper-gold ores	2 KG	Feb 9, 2026
Russia	Collector for coal enrichment	2 KG	Feb 9, 2026
Russia	Collector for copper and lead	2 KG	Feb 9, 2026
Russia	Collector for low-sulfur copper minerals associated with gold and silver	2 KG	Feb 9, 2026

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GY-Sodium Thiosulfate

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