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MAGNESIUM CARBONATEICSC: 0969
May 2010
CAS #: 546-93-0Magnesite
Carbonic acid, magnesium salt
EINECS #: 208-915-9

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.        In case of fire in the surroundings: all extinguishing agents allowed.   

   
  SYMPTOMS ACUTE HAZARDS FIRST AID
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 CLASSIFICATION & 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. 

According to UN GHS Criteria

No hazard classification according to GHS criteria 

Transportation
UN Classification
 

STORAGE
Separated from acids. 
PACKAGING
 
MAGNESIUM CARBONATE ICSC: 0969
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
WHITE POWDER. 

Physical dangers
 

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

Formula: MgCO3
Molecular mass: 84.3
Decomposes at 350°C
Relative density (water = 1): 2.95
Solubility in water, g/100ml at 20°C: 0.01 (very poor) 


EXPOSURE & HEALTH EFFECTS

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

Effects of short-term exposure
 

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

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


Occupational exposure limits
 

ENVIRONMENT
 

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

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations
       MAGNESIUM CARBONATE (JECFA Evaluation)