Product Name: Magnesium Carbonate
Chemical Formula: MgCO3
Other Names: Magnesite, Magnesia Alba
CAS Number: 546-93-0
Intended Use: Filler, drying agent, fireproofing, antacid, gym chalk, food additive
Manufacturer Contact: Refer to distributed packaging or obtain from supplier directly
Emergency Telephone Number: Local Poison Control or National Chemical Emergency Response
Classification: Not classified as hazardous according to OSHA regulations or GHS
Label Elements: No pictogram required, signal word not assigned
Hazard Statements: May cause mechanical irritation to eyes, skin, and respiratory tract on excessive exposure
Precautionary Statements: Avoid dust formation, use with adequate ventilation, wash contact areas after handling
Routes of Exposure: Inhalation, ingestion, skin, and eye contact
Health Effects: Short-term symptoms include coughing or eye redness, long-term effects rarely documented in industrial exposure without gross mishandling
Physical Hazards: No major physical hazards identified, non-flammable
Environmental Hazards: No significant hazards known to aquatic or land life under normal use
Magnesium Carbonate: 98-100%
Synonyms: Carbonic acid magnesium salt
Impurities: Trace amounts of calcium carbonate, silica, iron oxide depending on mineral source
Formula Weight: 84.31 g/mol
Component Analysis: No hazardous components present at or above regulated thresholds
Additives: No intentional additives, product purity based on manufacturing specification and regulatory requirements
Inhalation: Move person to fresh air, obtain medical attention for persistent cough or discomfort
Eye Contact: Rinse cautiously with water for at least 15 minutes, remove contact lenses if present and easy to do
Skin Contact: Wash with soap and water, seek medical attention if irritation develops
Ingestion: Rinse mouth, drink water if conscious, do not induce vomiting; for symptoms or large quantities, seek medical advice
Medical Notes: Product considered practically non-toxic, treatment is symptomatic and supportive
Most Important Symptoms/Effects: Mild irritation; no delayed or chronic effects expected with normal usage
Suitable Extinguishing Media: Use water spray, dry chemical, foam, or carbon dioxide; product is not flammable
Unsuitable Extinguishing Media: None known for product
Fire Hazards: Does not support combustion
Hazardous Combustion Products: Magnesium oxide and carbon dioxide may form if exposed to high temperature
Protective Equipment: Wear standard protective clothing and self-contained breathing apparatus if involved in fire
Special Procedures: Evacuate area if large quantities ignite other combustible materials, maintain upwind position
Personal Precautions: Avoid dust generation, wear suitable respiratory protection for large spills
Protective Equipment: Gloves, safety goggles, dust mask or respirator
Environmental Precautions: Prevent release to public sewers or open waterways in bulk form
Spill Cleanup: Sweep or vacuum up material, collect in airtight container, ventilate area thoroughly
Waste Disposal: See local regulations, non-hazardous waste under most circumstances
Decontamination: Wash area with water after material removal, avoid creating airborne dust; standard cleaning protocols apply
Safe Handling: Minimize dust, avoid contact with eyes or prolonged skin exposure, use in well-ventilated areas
Handling Procedures: Keep containers closed, use mechanical handling for bulk quantities
Conditions for Safe Storage: Store in cool, dry, well-ventilated area; protect from moisture and incompatible materials
Container Requirements: Use original, airtight containers provided by supplier
Incompatibilities: Strong acids, ammonium salts, sources of moisture
Storage Class: General purpose storage; compatible with most common construction materials
Occupational Exposure Limits: ACGIH TLV (TWA): 10 mg/m³ (inhalable); 3 mg/m³ (respirable, nuisance dust)
Engineering Controls: Use local exhaust ventilation, process enclosures, or other technical measures to keep airborne levels below regulatory limits
Personal Protection—Eyes: Safety glasses with side-shields or dust goggles
Personal Protection—Skin: Lightweight, long-sleeve workwear, protective gloves
Personal Protection—Respiratory: Dust mask (N95 or better) if airborne dust is generated above exposure limits
Hygiene Measures: Wash hands before eating, drinking, or smoking; remove contaminated clothing and clean before reuse
Appearance: Fine white powder, crystalline or granular
Odor: Odorless
Odor Threshold: Not applicable
pH: 9-10 (suspension in water)
Melting Point/Freezing Point: Decomposes above 350°C (releases CO2)
Boiling Point: Not applicable (decomposes before boiling)
Flash Point: None
Evaporation Rate: Not applicable
Flammability: Non-flammable
Vapor Pressure: Negligible
Solubility in Water: Slight (<0.1 g/100 mL at 20°C)
Partition Coefficient: Not applicable
Auto-Ignition Temperature: Not self-igniting
Decomposition Temperature: Above 350°C
Viscosity: Not applicable
Chemical Stability: Stable under normal conditions of use and storage
Possibility of Hazardous Reactions: Reacts with acids producing carbon dioxide gas
Conditions to Avoid: Prolonged contact with strong acids and moisture
Materials to Avoid: Hydrochloric acid, sulfuric acid, ammonium salts, strong oxidizers
Hazardous Decomposition Products: Carbon dioxide, magnesium oxide at extreme temperatures
Polymerization: Will not occur
Likely Routes of Exposure: Inhalation, skin, and eye contact
Acute Toxicity: Low, not expected to cause toxic effects in typical workplace exposures; oral LD50 (rat) >5000 mg/kg
Chronic Toxicity: No evidence of carcinogenicity, mutagenicity, or reproductive toxicity in current scientific literature
Skin Sensitization: No reports of skin sensitization
Irritation: Dust may cause mechanical irritation to eyes, mucous membranes
Other Information: Not listed under NTP, IARC, or OSHA as carcinogen
Medical Conditions Aggravated by Exposure: Pre-existing respiratory conditions may be aggravated by excessive dust exposure
Ecotoxicity: Not expected to be toxic to aquatic or terrestrial organisms
Aquatic Toxicity: Insoluble in water, not expected to bioaccumulate or persist in aquatic environments
Persistence and Degradability: Chemically stable and not biodegradable
Bioaccumulative Potential: Low; negligible bioaccumulation factor
Mobility in Soil: Low mobility, binds to soil particles
Other Adverse Effects: No known significant impacts; product used in agriculture as a soil amendment
Disposal Methods: Dispose of according to local, state, and federal regulations
Waste Classification: Not classified as hazardous waste; usually landfilled as non-hazardous material
Packaging Disposal: Recycle empty packaging or dispose of in standard waste stream
Special Precautions: Avoid large-scale uncontrolled releases which could affect air quality by dust
Reuse/Recycling: Inert product can be reused in many applications if uncontaminated
UN Number: Not regulated
UN Proper Shipping Name: Not classified as dangerous goods for transport
Transport Hazard Class: Not applicable
Packing Group: Not applicable
Regulatory Status: Transported widely by road, sea, and air without restriction
Special Precautions: Avoid container damage to prevent dust escape; label containers appropriately during transit
U.S. Regulations: Not subject to reporting under CERCLA, SARA Title III; TSCA-listed ingredient
European Regulations: Not classified as hazardous under REACH, CLP; EINECS: 208-915-5
Canadian Regulations: DSL and NDSL listed
Other Global Inventories: Listed in AICS, ENCS, IECSC, NZIoC, KECI, PICCS
Workplace Controls: Employers follow OSHA 29 CFR 1910.1200 and relevant workplace standards
Label Requirements: No mandatory hazard pictograms or warnings under GHS; may include dust warning for worker information
Additional Information: End-users should review occupational safety regulations depending on worksite jurisdiction
