Magnesite
Carbonic acid, magnesium salt
MgCO3
Molecular mass: 84.3
ICSC # 0969
CAS # 546-93-0
RTECS # OM2470000
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible.
Gives off irritating or toxic fumes (or gases) in a fire.
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In case of fire in the surroundings: all extinguishing agents allowed.
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Explosion
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Exposure
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PREVENT DISPERSION OF DUST!
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•Inhalation
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Cough.
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Avoid inhalation of fine dust and mist.
Local exhaust or breathing protection.
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Fresh air, rest.
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•Skin
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Protective gloves.
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Rinse skin with plenty of water or shower.
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•Eyes
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Safety spectacles.
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•Ingestion
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Spillage Disposal
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Storage
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Packaging & Labelling
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Sweep spilled substance into covered containers; if appropriate, moisten first to prevent dusting.
(Extra personal protection: P1 filter respirator for inert particles).
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Separated from
acids.
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Important Data
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Physical State; Appearance:
WHITE POWDER.
Physical Dangers:
Chemical Dangers:
The substance decomposes
on heating
producing acrid smoke and irritating fumes.
Reacts with acids liberating carbon dioxide gas.
Occupational Exposure Limits:
TLV: 10 mg/m3 (as TWA) (ACGIH 1995-1996).
OSHA PEL: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
NIOSH IDLH: N.D. See: IDLH INDEX
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation of its aerosol.
Inhalation Risk:
Evaporation at 20°C is negligible; a nuisance-causing concentration of airborne particles can, however, be reached quickly on spraying or when dispersed, especially if powdered.
Effects of Short-Term Exposure:
Effects of Long-Term or Repeated Exposure:
The substance may have effects on the lungs if the magnesite contains more than 1% crystalline silica.
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Physical
Properties
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Melting point (decomposes): 350°C
Relative density (water = 1): 2.95
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Solubility in water, g/100 ml: none
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Environmental
Data
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N O T E S
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If magnesite contains >1% crystalline silica,
also consult
ICSC # 0808.
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ADDITIONAL INFORMATION
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ICSC: 0969
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MAGNESIUM CARBONATE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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