Sodium Bisulfite 40%

Product Identifier

Sodium Bisulfite 40%

Concentration

40%

CAS Number

7631-90-5

Chemical Formula

HNaO3S

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.

Signal Word

Danger

Hazard Statements

• EUH031
• 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.
• P301+P312
• P330Rinse mouth.
• P501Dispose of contents and container in accordance with local, regional, national, and international regulations.

Hazard (H) and precautionary (P) statements and pictograms conform to GHS Rev. 9. The full classification rationale is in the downloadable SDS PDF.

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.

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.

Protective Equipment

Wear self-contained breathing apparatus and full protective clothing.

Hazardous Combustion Products

May include carbon oxides and other toxic fumes. See Section 10.

Personal Precautions

Use PPE as described in Section 8. Ensure adequate ventilation. Evacuate personnel to safe areas.

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.

Occupational Exposure Limits

No established 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.

Appearance

Clear, colorless to light-yellow liquid

Form

Liquid

Odor

Slight sulfur dioxide odor

pH

4.1000

Specific Gravity

~1.33

Density

1.32-1.35 g/cm³ (20°C) g/cm³

Boiling Point

~100-103 °C °C

Melting Point

< 0 °C °C

Flash Point

Not applicable (non-combustible aqueous solution) °C

Solubility

Miscible with water

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

Chemical Stability

Stable under recommended storage conditions.

Possibility of Hazardous Reactions

None under normal processing conditions.

Conditions to Avoid

Heat, sparks, open flame, and incompatible materials.

Incompatible Materials

Strong acids, strong bases, reactive metals, water (for some concentrated forms).

Hazardous Decomposition Products

May produce carbon oxides and other toxic fumes when heated to decomposition.

See Section 2 for GHS hazard classification.

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.

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. Refer to the downloadable SDS PDF for international transport details. Verify current regulations before international shipment.

SARA 311/312 hazard categories correspond to the GHS classification in Section 2. Data retrieved as of: California Proposition 65 2026-05-05; US EPA TSCA Active Inventory 2026-05-05; EPCRA SARA 313 (TRI) 2026-05-05.

Revision Date

2026-07-17

GHS Format

GHS Rev. 9 (2021), 16-section format per OSHA HCS 2024 (29 CFR 1910.1200).