Sodium Bisulfite 40% Technical Grade

Product Identifier

Sodium Bisulfite 40% Technical Grade

Grade

Technical

Concentration

40%

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)

Synonyms

Sodium hydrogen sulfite solution; sodium bisulfite liquor; SBS solution

Recommended Use

Dechlorination of water and wastewater; oxygen scavenger; reducing agent in water treatment, pulp and textile processing.

Restrictions on Use

Technical / water-treatment grade: not for food, beverage or drug use (see Sodium Metabisulfite Food Grade). Never mix with acids.

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.

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

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.

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.

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.

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).

Occupational Exposure Limits

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.

Appearance

Clear, colorless to pale yellow liquid

Odor

Pungent, sulfur dioxide odor

Odor Threshold

No data available

pH

3.5–5.0

Melting Point / Freezing Point

About 5 °C (41 °F), crystallization point; keep from freezing

Boiling Point

About 100–104 °C (212–219 °F), with release of sulfur dioxide

Flash Point

Not applicable

Evaporation Rate

No data available

Flammability (solid, gas)

No data available

Upper/Lower Flammability or Explosive Limits

No data available

Vapor Pressure

About 18–32 mmHg at 20 °C (water and sulfur dioxide)

Vapor Density

No data available

Relative Density

1.32–1.35 at 20 °C (water = 1)

Solubility

Completely miscible with water

Partition Coefficient (n-octanol/water)

No data available

Auto-ignition Temperature

No data available

Decomposition Temperature

No data available

Viscosity

3.6 mPa·s at 20 °C

Particle Characteristics

Not applicable

Form

Liquid

Density

1.32-1.35 g/cm³ (20°C)

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; 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.

See below for route-specific acute toxicity data.

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.

Carcinogen Classification

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

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

EPA RCRA Waste Codes

Not a listed waste and not characteristically corrosive (pH 3.5–5.0). Never discharge into acidic waste streams (releases sulfur dioxide).

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.

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.

CERCLA Reportable Quantity (RQ)

Sodium bisulfite (CAS 7631-90-5) 5,000 lb (2,270 kg), about 12,500 lb or 1,100 US gal of 40% solution; no single Alliance package reaches it. Not an EPCRA Section 313 chemical.

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

2026-10-08

Format

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