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MAGNESIUM CARBONATE
ICSC: 0969
Peer-Review Status: 06.05.2010 Validated
Magnesite
Carbonic acid, magnesium salt 
CAS #: 546-93-0 RTECS #: OM2470000
EINECS #: 208-915-9
    Formula: MgCO3
Molecular mass: 84.3

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.    In case of fire in the surroundings: all extinguishing agents allowed. 
EXPLOSION      
 
EXPOSURE      
Inhalation Cough.  Avoid inhalation of fine dust and mist. Use local exhaust or breathing protection.  Fresh air, rest. 
Skin   Protective gloves.  Rinse skin with plenty of water or shower. 
Eyes   Wear safety spectacles.  Rinse with plenty of water (remove contact lenses if easily possible). 
Ingestion   Do not eat, drink, or smoke during work.  Rinse mouth. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting.   
EC Classification
 
UN Classification
 
GHS Classification
No hazard classification according to GHS criteria 

EMERGENCY RESPONSE SAFE STORAGE
  Separated from acids. 

IMPORTANT DATA
Physical State; Appearance
WHITE POWDER. 

Physical dangers
 

Chemical dangers
Decomposes on heating. This produces irritating fumes. Reacts with acids. This produces carbon dioxide gas. 

Occupational exposure limits
TLV: 10mg/m³ as TWA; (ACGIH 1995).
MAK (not established):. 

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Inhalation risk
A nuisance-causing concentration of airborne particles can be reached quickly when dispersed. 

Effects of short-term exposure
 

Effects of long-term or repeated exposure
Lungs may be affected by repeated or prolongated exposure to dust particles. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Decomposes at 350°C
Relative density (water = 1): 2.95
Solubility in water, g/100ml at 20°C: 0.01 (very poor) 
 

NOTES
Magnesite (CAS 7760-50-1) is naturally occuring magnesium carbonate mineral. Magnesite can contain crystalline silica, see ICSC 0808. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
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    See Also:
       Toxicological Abbreviations
       MAGNESIUM CARBONATE (JECFA Evaluation)