Preliminary reference disclaimer
This preliminary safety reference is generated from structured MolGraph catalog fields and public reference-style data. It is not a supplier-issued Safety Data Sheet and should not be used as a substitute for supplier-issued documentation, workplace safety review, transport classification, or regulatory compliance decisions. For supplier SDS or COA, submit a documentation request through MolGraph.
Documentation status
Preliminary safety reference
Available
Supplier-issued SDS
Available by request
COA
Available by RFQ / lot confirmation
Transport classification
Requires shipment review
Identity
CAS Number
7772-98-7
Chemical name
Sodium Thiosulfate
Molecular formula
Na2O3S2
Molecular weight
158.11 g/mol
Synonyms
Sodium thiosulphate; Disodium thiosulfate; Sodothiol; Hypo; Chlorine Control; Chlorine Cure; Sodium thiosulfate, anhydrous; Thiosulfuric acid, disodium salt; Sodium thiosulfate (Na2S2O3); Sodium thiosulphate (Na2S2O3); Sodium oxide sulfide (Na2S2O3); Thiosulfuric acid (H2S2O3), disodium salt
InChIKey
AKHNMLFCWUSKQB-UHFFFAOYSA-L
PubChem CID
24477
Hazard / GHS Reference
Signal word
Warning
Catalog reference cue; confirm supplier documentation before use.
Hazard statements
H302, H315, H319, H335
Catalog reference cue; confirm supplier documentation before use.
Handling & PPE
- If exposed to a harmful environment, use a P95 (US) or P1 (EU/UK 143) particulate respirator. For higher level of protection, use an OV/AG/P99 (US) or ABEK-P2 (EU/UK 143) gas filter. Respirators must be tested and approved by government standards such as NIOSH (US) or CEN (EU).
- Dispose of remaining and non-recyclable solutions to a licensed company. Contact a professional organization with a waste disposal license to handle this substance. Burn in a chemical incinerator with a combustion and washing system if compatible with flammable solvents. Contaminated packaging is to be disposed of as unutilized product.
First Aid / Accidental Release
- Do not give anything to an unconscious person. Rinse mouth with water. Consult a physician.
- If inhaled, move the person to fresh air. If breathing stops, perform artificial respiration. Consult a physician.
- Rinse with plenty of water for at least 15 minutes and consult a physician.
- Wash with soap and plenty of water. Consult a physician.
- Use personal protective equipment. Avoid dust generation. Avoid inhalation of vapors, mist or gas. Ensure adequate ventilation. Evacuate personnel to a safe area. Avoid inhalation of dust. For personal protection, see
- Do not allow the product to enter drains.
- Dispose of remaining and non-recyclable solutions to a licensed company. Contact a professional organization with a waste disposal license to handle this substance. Burn in a chemical incinerator with a combustion and washing system if compatible with flammable solvents. Contaminated packaging is to be disposed of as unutilized product.
Firefighting / Stability
- Reactivity
Physical and Chemical Reference
Melting Point
48.5 °C
Catalog reference value; verify against supplier SDS before use.
Refractive Index
1.489
Catalog reference value; verify against supplier SDS before use.
Vapor Pressure
Estimated value, unit not specified
Catalog reference value; verify against supplier SDS before use.
Transport / Shipment Review
Shipment review
Shipment details require review before fulfillment.
Transport classification must be confirmed using supplier SDS and shipment documentation before dispatch.
- Transport classification must be confirmed using supplier SDS and shipment documentation before dispatch.