Industrial chemicals · Taylor, TXSafety Data Sheet · OSHA HCS 2024
Sodium Bisulfite 25% Solution – Technical Grade (NaHSO3)
Technical · 25%
The downloadable PDF is a print of this page and carries all 16 OSHA HCS sections.
- CAS number
- 7631-90-5
- UN number
- UN2693
- Hazard class · packing group
- 8 · PG III
- Structure
Structure · PubChem - Grade
- Technical · 25%
- Signal word
- Danger
- Hazards
- Proper shipping name
- Bisulfites, aqueous solutions, n.o.s. (Sodium bisulfite)
- Answer summary
Sodium Bisulfite 25% Solution – Technical Grade (NaHSO3) is regulated for transport under DOT 49 CFR — see the shipping classification below.
Identification
- Product Identifier
- Sodium Bisulfite 25% Solution – Technical Grade (NaHSO3)
- Grade
- Technical
- Concentration
- 25%
- CAS Number
- 7631-90-5
- Molecular Weight
- 104.06 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.
Hazard Identification
- Classification
- Acute toxicity (oral), Category 4
- Serious eye damage/eye irritation, Category 1
- Signal Word
- Danger
- Hazard Statements
- EUH031Contact with acids liberates toxic gas
- H302Harmful if swallowed
- H318Causes serious eye damage
- Precautionary Statements
- P264Wash hands and face thoroughly after handling.
- P270Do not eat, drink or smoke when using this product.
- P280Wear protective gloves, protective clothing, and eye/face protection.
- P301+P312IF SWALLOWED: Call a POISON CENTER or doctor if you feel unwell.
- P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
- P310Immediately call a POISON CENTER or doctor.
- P330Rinse mouth.
- P501Dispose of contents and container in accordance with local, regional, national, and international regulations.
Classification, hazard (H) and precautionary (P) statements and pictograms per OSHA HCS 2024 (29 CFR 1910.1200, Appendices A–C), aligned with GHS Rev. 7.
Composition / Information on Ingredients
| Component | CAS No. | Formula | Concentration |
|---|---|---|---|
| Sodium Bisulfite 25% Solution – Technical Grade (NaHSO3) | 7631-90-5 | — | 25% (w/w) |
Concentrations are nominal; lot-specific values appear on the Certificate of Analysis. Components not contributing to classification are omitted.
First-Aid Measures
- Eyes
- Rinse with plenty of water for at least 15 minutes. Remove contact lenses if present and easy to do. Continue rinsing. Seek medical attention immediately.
- Skin
- Immediately flush with plenty of water for at least 15 minutes while removing contaminated clothing. Wash with soap. Get medical attention immediately.
- Inhalation
- Move person to fresh air and keep comfortable for breathing. If breathing is difficult, give oxygen. If not breathing, give artificial respiration. Get medical attention immediately.
- Ingestion
- Do Not Induce Vomiting! Never give anything by mouth to an unconscious person. If conscious, wash out mouth with water. Get medical attention immediately.
- Most Important Symptoms and Effects
- Eye contact causes serious eye damage: pain, redness and corneal injury, which may be permanent.
- Ingestion may cause nausea, vomiting and abdominal pain; larger amounts may cause systemic poisoning.
- Immediate Medical Attention and Special Treatment
- Immediate medical attention is required after eye contact; eye damage may continue after exposure ends.
Fire-Fighting Measures
- Suitable Extinguishing Media
- Dry chemical, CO2, water spray. Use water spray to cool containers.
- Unsuitable Extinguishing Media
- Do not use a solid water stream as it may scatter and spread fire.
- Specific Hazards Arising from the Chemical
- Fire may release corrosive and toxic gases. Containers may rupture when heated.
- Protective Equipment
- Wear self-contained breathing apparatus and full protective clothing.
- Hazardous Combustion Products
- Sulfur dioxide on heating or contact with acids; sulfur oxides in a fire.
Accidental Release Measures
- Personal Precautions
- Use PPE as described in Section 8. Ensure adequate ventilation. Evacuate personnel to safe areas.
- Hazard-Specific Precautions
- Do not touch spilled material without protective equipment. Neutralize residue only with a method suitable for the material, then collect.
- Environmental Precautions
- Prevent leakage or spillage from entering drains, sewers, or waterways.
- Containment & Cleanup
- Absorb with inert material. Collect in appropriate waste container. Dispose per applicable regulations.
Handling and Storage
- 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. Use corrosion-resistant containers. Keep away from incompatible materials (see Section 10). Keep containers tightly closed.
- Specific Storage Precautions
- Keep tightly closed in a cool, ventilated area in polyethylene, fiberglass or stainless-steel containers, away from acids and oxidizers. Protect from freezing (crystallizes near 5 °C).
Exposure Controls / Personal Protection
Occupational Exposure Limits
| Limit | Value |
|---|---|
| NIOSH REL | 5 mg/m³ TWA |
- Engineering Controls
- Use adequate ventilation. Provide eyewash stations and quick-drench showers accessible to areas of use.
- Eye/Face Protection
- Wear chemical safety goggles or face shield.
- Skin Protection
- Wear chemical-resistant gloves and protective clothing.
- Respiratory Protection
- Use NIOSH-approved respirator if exposure limits are exceeded or irritation occurs.
Exposure limits sourced from NIOSH Pocket Guide, OSHA 29 CFR 1910.1000 and ACGIH TLVs.
Physical & Chemical Properties
- Appearance
- Clear, colorless to pale yellow liquid
- Odor
- Slight sulfur dioxide odor
- Odor Threshold
- No data available
- pH
- 3.8 - 5.0
- Melting Point / Freezing Point
- -9 to 0 °C (16 to 32 °F), freezing point (aqueous solution)
- Boiling Point
- 100 to 103 °C (212 to 217 °F) (aqueous solution)
- Flash Point
- Not applicable (non-combustible aqueous solution)
- Evaporation Rate
- No data available
- Flammability (solid, gas)
- No data available
- Upper/Lower Flammability or Explosive Limits
- No data available
- Vapor Pressure
- No data available
- Vapor Density
- No data available
- Relative Density
- ~1.20
- Solubility
- Miscible with water
- 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
- Not applicable
- Form
- Liquid
- Density
- ~1.18-1.22 g/cm³ (25%, 20°C)
Values shown reflect product-specific canonical data. Lot-specific ranges may vary; see the Certificate of Analysis for the shipped lot.
Stability and Reactivity
- 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; elevated temperature; prolonged exposure to air (slowly oxidizes to sulfate); freezing.
- Incompatible Materials
- Acids (release toxic sulfur dioxide gas); oxidizing agents; nitrites and nitrates.
- Hazardous Decomposition Products
- Sulfur dioxide on heating or contact with acids; sulfur oxides in a fire.
Toxicological Information
See Section 2 for GHS hazard classification.
- Likely Routes of Exposure
- Inhalation, skin contact, eye contact, ingestion.
- Symptoms
- Eye contact causes serious eye damage: pain, redness and corneal injury, which may be permanent.
- Ingestion may cause nausea, vomiting and abdominal pain; larger amounts may cause systemic poisoning.
- 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
| Agency | Status |
|---|---|
| IARC | Group 3 — not classifiable as to its carcinogenicity to humans (Sodium bisulfite; IARC agent: Bisulfites, Vol. 54). |
| NTP | Not listed as carcinogen. |
| OSHA | Not listed as carcinogen. |
Ecological Information
- Ecotoxicity
- Daphnia EC50: ~ 102 mg/L (100 h, Daphnia magna — 100-h toxicity threshold (non-standard window)); Fish LC50: 240 mg/L (96 h, Gambusia affinis, turbid water 17–22 °C)
- Persistence & Degradability
- Not persistent (inorganic; bisulfite oxidizes to sulfate); raises aquatic COD — Rapid biological decomposition (oxidizes to sulfate)
- Bioaccumulative Potential
- Not Available
- Mobility in Soil
- Slight soil absorption/mobility
Disposal Considerations
Dispose of contents/container in accordance with applicable federal, state, and local regulations. Do not dispose of into drains or waterways.
If discarded, this material may be a corrosive hazardous waste (EPA RCRA D002, 40 CFR 261.22): aqueous with pH ≤ 2 or ≥ 12.5, or a liquid that corrodes steel at more than 6.35 mm per year. The waste generator must make the final hazardous-waste determination.
Transport Information
US DOT (49 CFR)
- UN Number
- UN2693
- Proper Shipping Name
- Bisulfites, aqueous solutions, n.o.s. (Sodium bisulfite)
- Hazard Class
- 8
- Packing Group
- III
IMDG / IATA classifications may differ from US DOT. Verify current regulations before international shipment.
Regulatory Information
| Inventory / List | Status |
|---|---|
| California Proposition 65 | Not listed |
| US EPA TSCA Active Inventory | Listed |
| EPCRA SARA 313 (TRI) | Not listed |
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.
Other Information
- Revision Date
- Format
- 16-section format per OSHA HCS 2024 (29 CFR 1910.1200, Appendix D), aligned with GHS Rev. 7.
Disclaimer: The information provided in this Safety Data Sheet is correct to the best of our knowledge at the date of publication. It relates only to the specific product identified and does not relate to its use in combination with other materials. ALLIANCE CHEMICAL MAKES NO WARRANTY, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. ALLIANCE CHEMICAL DOES NOT ASSUME LIABILITY FOR LOSS, INJURY, DAMAGE, OR EXPENSE ARISING FROM THE HANDLING, STORAGE, USE, OR DISPOSAL OF THIS PRODUCT.
Alliance Chemical, 204 South Edmond Street, Taylor, TX 76574. Published by Alliance Chemical from first-party canonical product data. Our authority is hands-on chemical handling, DOT/GHS-compliant shipping, and government-registered distribution — not bench chemistry. This Safety Data Sheet is prepared from the regulatory data on file for this product.