Magnesium hydroxide

  • Milk of magnesia
  • Magnesium hydrate
  • Magnesia magma
Formula
Mg(OH)2
Structure
Description
White, amorphous powder. Odorless.
Uses
Medication: antacid, cathartic.

Registry Numbers and Inventories.
CAS
1309-42-8
EC (EINECS/ELINCS)
215-170-3
S 22 24/25
RTECS
OM3570000
RTECS class
Drug; Human Data
Merck
13,5693
Beilstein/Gmelin
15840 (G)
Swiss Giftliste 1
G-8166
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H2MgO2
Formula mass
58.31
Decomposition point, °C
350
Density
2.3261 - 2.3631 g/cm3
Solubility in water
9 mg/L
Thermal expansion
4.27E-05 - 4.67E-05/K

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Keep container tightly closed. Do not get on skin or in eyes. Do not ingest or inhale.
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. Wear a self contained breathing apparatus and appropriate Personal protection. (See Exposure Controls, Personal Protection section). Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions.
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Phosphorus (spontaneous ignition).
Decomposition
Oxides of magnesium.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: Substance is noncombustible; use agent most appropriate to extinguish surrounding fire.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Repeated exposure may cause kidney damage and digestive tract abnormalities.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Excessive amounts of magnesium may cause central nervous system depression, respiratory paralysis, and cardiac
   Inhalation
Dust is irritating to the respiratory tract.
   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. 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 if cough or other symptoms appear.
   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.
   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.
USCG CHRIS Code
MHS
 
IMO Chemical Code
18
IMO Pollution Category
III