Magnesium carbonate

  • Magnesite
Formula
MgCO3
Structure
Description
Odorless, white powder.
Uses
Used in food as alkali, drying agent, color retention agent, anticaking agent, carrier.

Registry Numbers and Inventories.
CAS
546-93-0
EC (EINECS/ELINCS)
208-915-9
RTECS
OM2470000
RTECS class
Agricultural Chemical and Pesticide
Beilstein/Gmelin
195908 (G)
EPA OPP
73503
Swiss Giftliste 1
G-7477
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CO3Mg
Formula mass
84.31
Decomposition point, °C
350
Density
3.03 g/cm3 (16 C)
Solubility in water
100 mg/L
Thermal expansion
0.0000213/K

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with skin and eyes. Keep container tightly closed. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Acids (mineral, oxidizing, e.g. chromic acid, hypochlorous acid, nitric acid, sulfuric acid), strong oxidizing agents.
Decomposition
Carbon dioxide, oxides of magnesium.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Substance is noncombustible; use agent most appropriate to extinguish surrounding fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: ppm; 10 mg/m3 (as TWA) (ACGIH 1995-1996). OSHA PEL: TWA 100 ppm (435 mg/m3) NIOSH REL: TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3) NIOSH IDLH: 900 ppm
Poison_Class
-
Exposure effects
May cause digestive tract and cardiac disturbances.
   Ingestion
May cause irritation of the digestive tract. May cause central nervous system depression. May cause cardiac abnormalities.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation. Low hazard for usual industrial handling.
   Eyes
May cause mild eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.