NIOSH Pocket Guide to Chemical Hazards

Magnesite CAS 546-93-0
MgCO3 RTECS OM2470000
Synonyms & Trade Names
Carbonate magnesium, Hydromagnesite, Magnesium carbonate, Magnesium(II) carbonate [Note: Magnesite is a naturally-occurring form of magnesium carbonate.]
DOT ID & Guide
Exposure
Limits
NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
OSHA PEL: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
IDLH N.D. Conversion
Physical Description
White, odorless, crystalline powder.
MW: 84.3
BP: Decomposes
MLT: 662°F (Decomposes)
Sol: 0.01%
VP: 0 mmHg (approx)
IP: NA

Sp.Gr: 2.96
Fl.P: NA
UEL: NA
LEL: NA

Noncombustible Solid
Incompatibilities & Reactivities
Acids, formaldehyde
Measurement Methods
NIOSH 0500, 0600
Personal Protection & Sanitation
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately

Breathing: Fresh air

Respirator Recommendations To be added later
Exposure Routes inhalation, skin and/or eye contact
Symptoms Irritation eyes, skin, respiratory system; cough
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION