Beryllium oxide

  • Beryllium monoxide
Formula
BeO
Structure
Description
Odorless white solid.
Uses
Electric heat sinks, electrical insulators, microwave oven components, gyroscopes, military vehicle armor, rocket nozzles, crucibles, thermocouple tubing, laser structural components.

Registry Numbers and Inventories.
CAS
1304-56-9
EC (EINECS/ELINCS)
215-133-1
EC Index Number
004-003-00-8
EC Class
Carcinogenic Category 2; Very toxic; Toxic; Irritant; Sensitising
RTECS
DS4025000
RTECS class
Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
1566
Merck
12,1216
Beilstein/Gmelin
13629 (G)
Swiss Giftliste 1
G-6521
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
BeO
Formula mass
25.01
Melting point, °C
2410
Boiling point, °C
4300
Odor Threshold Odor threshold Odorless
Density
3.01 g/cm3
Solubility in water
Insoluble
Dielectric constant
7.16 (25 C)
Thermal expansion
3.3E-6/K (27 C)
Heat of fusion
71.1 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Avoid contact with skin and eyes. 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 gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
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
Vacuum or sweep up material and place into a suitable disposal container.
Stability
No data.
Incompatibilities
Incompatible with the following: Acids, caustics, chlorinated hydrocarbons, oxidizers, molten lithium, magnesium.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam.
Fire potential
Not flammable
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Toxic beryllium oxide fume may form in fire.

Health.
Exposure limit(s)
NIOSH TWA: 2 µg/m3 NIOSH: occupational carcinogen
Carcinogin
G-A1, I-1, N-1, CP65
Poison_Class
1
Exposure effects
Fatigue, headache, and seizures may occur.
   Ingestion
May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.
   Inhalation
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
   Skin
May cause skin irritation. No information regarding skin irritation and other potential effects was found.
   Eyes
May cause eye irritation. No information regarding eye irritation and other potential effects was found.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
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
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
1566
Response guide
Hazard class
6.1
Packing Group
II; III
 
USCG CHRIS Code
BEO