Magnesium oxide

  • Magnesia
  • Calcined brusite
  • Calcined magnesia
Formula
MgO
Structure
Description
Fine odorless white powder, hygroscopic.
Uses
Chemical intermediate medicinals & other chems, component of animal feeds, fertilizers, insulation, & wallboard, component of petroleum additives, oxychloride & oxysulfate cement, agent in pulp & paper mfr, food chem, rubber accelerator, component of electrical heating rods, misc applications.

Registry Numbers and Inventories.
CAS
1309-48-4
EC (EINECS/ELINCS)
215-171-9
RTECS
OM3850000
RTECS class
Tumorigen; Human Data
UN (DOT)
1418
Merck
12,5713
Beilstein/Gmelin
13722 (G)
EPA OPP
9235
Swiss Giftliste 1
G-2368
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
MgO
Formula mass
40.30
Melting point, °C
2800
Boiling point, °C
3600
Vapor pressure, mmHg
0.3 (1727 C)
Density
3.58 g/cm3
Solubility in water
90 g/L
Dielectric constant
11 (20 C)
Thermal expansion
1.38E-5/L
Heat of fusion
77.4 kJ/mol
Heat of vaporization
330.7 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Keep away from water. Keep containers tightly closed.
Does not meet criteria
Handling
Wash thoroughly after handling. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Wash clothing before reuse. Keep from contact with moist air and steam.
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
Wash area with soap and water. Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Do not get water inside containers.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents; reacts violently with phosphorous pentachloride, chlorine trichloride, or bromine pentafluoride. Will absorb CO2 from air.
Decomposition
None.

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. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam. Do NOT get water inside containers.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
OSHA PEL: TWA 15 mg/m3 NIOSH REL: See Appendix D NIOSH IDLH: 750 mg/m3
Poison_Class
4
Exposure effects
Lethargy, hyporeflexia, weakness, and subjective feeling of thirst and heat may occur. Excessive absorption of magnesium from cathartics may result in CNS depression and seizures, most notably in renal failure patients.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May cause central nervous system depression.
   Inhalation
May cause respiratory tract irritation. Inhalation of fumes may cause metal fume fever, which is characterized by flu-like symptoms with metallic taste, fever, chills, cough, weakness, chest pain, muscle pain and increased white blood cell count.
   Skin
May cause skin irritation.
   Eyes
May cause 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
Get medical aid if irritation develops or persists. Wash clothing before reuse. Flush skin with plenty of soap and water.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1418
Response guide
USCG CHRIS Code
MGU
 
HS Code
2519 90 10