Industrial chemicals · Taylor, TXSafety Data Sheet · OSHA HCS 2024
Magnesium Hydroxide ACS
ACS
The downloadable PDF is a print of this page and carries all 16 OSHA HCS sections.
- CAS number
- 1309-42-8
- Structure
Structure · PubChem - Grade
- ACS
Identification
- Product Identifier
- Magnesium Hydroxide ACS
- Grade
- ACS
- CAS Number
- 1309-42-8
- Molecular Weight
- 58.320 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
- Signal Word
- Not applicable
- Hazard Statements
- Not classified as hazardous under GHS based on available data.
- Precautionary Statements
- No specific GHS precautionary statements required.
Composition / Information on Ingredients
| Component | CAS No. | Formula | Concentration |
|---|---|---|---|
| Magnesium Hydroxide | 1309-42-8 | H2MgO2 | >95% (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 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.
Fire-Fighting Measures
- 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
- Magnesium oxide and water vapor on strong heating.
Accidental Release Measures
- 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.
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. Keep away from incompatible materials (see Section 10). Keep containers tightly closed.
- Specific Storage Precautions
- Keep containers tightly closed in a dry, cool, well-ventilated place away from incompatible materials. Non-combustible solid; minimize dust formation and accumulation.
Exposure Controls / Personal Protection
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.
Physical & Chemical Properties
- Appearance
- Fine white crystalline powder, opaque
- Odor
- Odorless
- Odor Threshold
- No data available
- pH
- pH = 9.5-10.5 (aqueous slurry)
- Melting Point / Freezing Point
- 350 °C (decomposes)
- Boiling Point
- 350 °C
- Flash Point
- N/A
- 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
- Practically insoluble in water and in ethanol
- 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
- 2.36 g/mL
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
- Dust formation; contact with strong acids.
- Incompatible Materials
- Strong acids; strong oxidizing agents; phosphorus (spontaneous ignition); maleic anhydride.
- Hazardous Decomposition Products
- Magnesium oxide and water vapor on strong heating.
Toxicological Information
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
| Agency | Status |
|---|---|
| IARC | Not listed as carcinogen. |
| NTP | Not listed as carcinogen. |
| OSHA | Not listed as carcinogen. |
Ecological Information
- Ecotoxicity
- Data not available. Avoid release to the environment.
- Persistence & Degradability
- Not applicable (inorganic); low aqueous solubility, no aquatic hazard classification reported — Not applicable (inorganic)
- Bioaccumulative Potential
- Not Available
- Mobility in Soil
- Not Available
Disposal Considerations
Dispose of contents/container in accordance with applicable federal, state, and local regulations. Do not dispose of into drains or waterways.
Transport Information
Not regulated for transport under US DOT 49 CFR Subchapter C, IMDG, or IATA DGR.
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.