Sodium Metabisulfite - ACS Grade

Product Identifier

Sodium Metabisulfite - ACS Grade

Grade

ACS Grade

CAS Number

7681-57-4

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.

Classification

• Acute toxicity (oral), Category 4
• Serious eye damage/eye irritation, Category 1

Signal Word

Danger

Hazard Statements

• 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.
• P313Get medical advice or attention.
• 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

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 gas (released on contact with acids and on heating) with sodium oxides and a sodium sulfide residue on thermal decomposition.

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. 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 heat, moisture, water, acids and oxidizing agents; it releases sulfur dioxide slowly in humid air. The product consumes oxygen, so oxygen deficiency can develop in closed containers and tanks.

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

White to yellowish

Odor

In the presences of traces of water, it develops an odor of sulfur dioxide

Odor Threshold

No data available

pH

4 to 6

Melting Point / Freezing Point

greater than 302 °F (Decomposes) (NIOSH, 2024)

Boiling Point

Decomposes (NIOSH, 2024)

Flash Point

No data available

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

No data available

Solubility

Clear, colorless to faintly yellow solution

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

Density

1.4 (NIOSH, 2024) - Denser than water; will sink

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, water or humid air; heat above 150 °C (302 °F), which rapidly evolves toxic, corrosive sulfur dioxide; dust formation; prolonged exposure to air or moisture.

Incompatible Materials

Acids (release toxic sulfur dioxide gas); water and ice; strong oxidizing agents; nitrites and nitrates; chlorates; alkalis and strong bases; heavy-metal compounds.

Hazardous Decomposition Products

Sulfur dioxide gas (released on contact with acids and on heating) with sodium oxides and a sodium sulfide residue on thermal decomposition.

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

Ecotoxicity

Fish LC50: 32 mg/L (96 h, Lepomis macrochirus, static 22 °C, pH 3.8–6.7 (oxygen scavenger; DO/pH-mediated); 95% CI 21–50 mg/L)

Persistence & Degradability

Not applicable (inorganic reducing agent; dissociates/oxidizes to sulfate, not bioaccumulative)

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.