Sodium Thiosulfate Technical Grade

Product Identifier

Sodium Thiosulfate Technical Grade

Grade

Technical

CAS Number

10102-17-7

Chemical Formula

Na2S2O3·5H2O

Molecular Weight

248.18 g/mol

Manufacturer

Alliance Chemical
204 South Edmond Street, Taylor, TX 76574

Emergency Phone

Chemtel 1-800-255-3924 (24/7)

Recommended Use

Industrial / laboratory chemical. See Section 7.

Restrictions on Use

No restrictions identified beyond the conditions of safe use in Sections 7 and 8.

Signal Word

Not applicable

Hazard Statements

Not classified as hazardous under GHS based on available data.

Precautionary Statements

No specific GHS precautionary statements required.

Concentrations are nominal; lot-specific values appear on the Certificate of Analysis. Components not contributing to classification are omitted.

Eyes

Rinse with water. Get medical attention if irritation develops or persists.

Skin

Wash with soap and water. Get medical attention if irritation develops.

Inhalation

Move to fresh air if discomfort occurs.

Ingestion

Rinse mouth with water. Get medical attention if you feel unwell.

Most Important Symptoms and Effects

• No specific symptoms are expected from the hazards identified in Section 2.

Immediate Medical Attention and Special Treatment

• Treat symptomatically. Get medical attention if symptoms develop or persist.

Suitable Extinguishing Media

Use water spray, alcohol-resistant foam, dry chemical, or CO2. Use measures appropriate to local circumstances.

Unsuitable Extinguishing Media

Do not use a solid water stream as it may scatter and spread fire.

Specific Hazards Arising from the Chemical

Containers may rupture when heated.

Protective Equipment

Wear self-contained breathing apparatus and full protective clothing.

Hazardous Combustion Products

Sulfur dioxide, hydrogen sulfide and sodium oxides on heating or contact with acids.

Personal Precautions

Wear safety glasses and gloves for cleanup. Spills can make floors slippery.

Environmental Precautions

Avoid releasing large quantities to drains or waterways.

Containment & Cleanup

Absorb or wipe up, then rinse the area with water. Dispose of according to local regulations.

Safe Handling

Use with adequate ventilation. Avoid contact with skin, eyes, and clothing. Wash thoroughly after handling. Keep container closed when not in use.

Safe Storage

Store in a cool, dry, well-ventilated area. Keep away from incompatible materials (see Section 10). Keep containers tightly closed.

Specific Storage Precautions

Keep containers tightly closed in a cool, dry, well-ventilated place away from direct sunlight and intense heat. The pentahydrate effloresces in dry air and deliquesces in moist air: protect from humidity swings. Store with other inorganic salts, away from acids and oxidizers.

Occupational Exposure Limits

No established occupational exposure limits.

Engineering Controls

General ventilation is normally adequate.

Eye/Face Protection

Safety glasses are recommended.

Skin Protection

Gloves are recommended for prolonged or repeated contact.

Respiratory Protection

Not normally required.

Appearance

Large Translucent Crystals

Odor

Odorless

Odor Threshold

No data available

pH

6 – 8

Melting Point / Freezing Point

48.3 °C (118.9 °F)

Boiling Point

Not applicable (loses water of hydration at 100 °C)

Flash Point

Not applicable (non-flammable)

Evaporation Rate

No data available

Flammability (solid, gas)

No data available

Upper/Lower Flammability or Explosive Limits

No data available

Vapor Pressure

Negligible at 20 °C

Vapor Density

No data available

Relative Density

1.69

Solubility

Very soluble in water; practically insoluble in alcohol

Partition Coefficient (n-octanol/water)

No data available

Auto-ignition Temperature

No data available

Decomposition Temperature

No data available

Viscosity

No data available

Particle Characteristics

No data available

Form

Solid

Density

1.05 - 1.25 g/cm3

Values shown reflect product-specific canonical data. Lot-specific ranges may vary; see the Certificate of Analysis for the shipped lot.

Reactivity

Not reactive under normal conditions of use and storage.

Chemical Stability

Stable under recommended storage conditions.

Possibility of Hazardous Reactions

None under normal processing conditions.

Conditions to Avoid

Contact with acids and oxidizers; intense heat; humidity extremes.

Incompatible Materials

Strong acids (release sulfur dioxide); strong oxidizing agents; sodium nitrite and sodium nitrate (violent reaction); iodine and iodides; lead, silver and mercury salts.

Hazardous Decomposition Products

Sulfur dioxide, hydrogen sulfide and sodium oxides on heating or contact with acids.

See Section 2 for GHS hazard classification.

Likely Routes of Exposure

Inhalation, skin contact, eye contact, ingestion.

Symptoms

• No specific symptoms are expected from the hazards identified in Section 2.

Delayed and Chronic Effects

• No delayed or chronic effects identified beyond the classification in Section 2.

Numerical Measures of Toxicity

No data available

Carcinogen Classification

Ecotoxicity

Data not available. Avoid release to the environment.

Persistence & Degradability

Not Available

Bioaccumulative Potential

Not Available

Mobility in Soil

Not Available

Dispose of contents/container in accordance with applicable federal, state, and local regulations. Do not dispose of into drains or waterways.

Not regulated for transport under US DOT 49 CFR Subchapter C, IMDG, or IATA DGR.

SARA 311/312 hazard categories correspond to the GHS classification in Section 2. Data retrieved as of: California Proposition 65 2026-10-02; US EPA TSCA Active Inventory 2026-10-02; EPCRA SARA 313 (TRI) 2026-10-02.

Revision Date

2026-10-13

Format

16-section format per OSHA HCS 2024 (29 CFR 1910.1200, Appendix D), aligned with GHS Rev. 7.