| Identification | More | [Name]
BERYLLIUM OXIDE | [CAS]
1304-56-9 | [Synonyms]
BERYLLIUM (II) OXIDE
Beryllium monoxide
BERYLLIUM OXIDE
Berylla
Beryllia
Beryllium oxide (BeO)
Beryllium oxide, alpha
berylliumoxide(beo)
bromellete
Glucina
naturalbromellite
Thermalox
thermalox995
BERYLLIUM OXIDE, 99.99%
Berylliumoxide(99.95+%-Be)
Beryllium oxide, 99.95% (metals basis)
Beryllium oxide, 99% (metals basis) | [EINECS(EC#)]
215-133-1 | [Molecular Formula]
BeO | [MDL Number]
MFCD00003457 | [Molecular Weight]
25.01 | [MOL File]
1304-56-9.mol |
| Chemical Properties | Back Directory | [Appearance]
solid | [Melting point ]
2575°C | [Boiling point ]
4300°C | [density ]
3.01 g/mL at 25 °C(lit.)
| [refractive index ]
1.733 | [Fp ]
4300°C | [solubility ]
insoluble in H2O; slightly soluble in acid solutions, alkaline solutions | [form ]
Powder | [color ]
white | [Specific Gravity]
3.01 | [Stability:]
Stable. | [Water Solubility ]
Insoluble in water. Slowly soluble in concentrated acids, alkali hydroxides | [Crystal Structure]
Hexagonal, Wurtzite (Zincite) Structure - Space Group P 63mc | [Merck ]
14,1172 | [Exposure limits]
ACGIH: TWA 0.00005 mg/m3
OSHA: Ceiling 2 μg/m3
NIOSH: IDLH 4 mg/m3; Ceiling 0.0005 mg/m3 | [CAS DataBase Reference]
1304-56-9(CAS DataBase Reference) | [EPA Substance Registry System]
Beryllium oxide (1304-56-9) |
| Safety Data | Back Directory | [Hazard Codes ]
T+ | [Risk Statements ]
R49:May cause cancer by inhalation.
R25:Toxic if swallowed.
R26:Very Toxic by inhalation.
R36/37/38:Irritating to eyes, respiratory system and skin .
R43:May cause sensitization by skin contact.
R48/23:Toxic: danger of serious damage to health by prolonged exposure through inhalation . | [Safety Statements ]
S53:Avoid exposure-obtain special instruction before use .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . | [RIDADR ]
UN 1566 6.1/PG 2
| [WGK Germany ]
1
| [RTECS ]
DS4025000
| [TSCA ]
Yes | [HazardClass ]
6.1 | [PackingGroup ]
II | [Hazardous Substances Data]
1304-56-9(Hazardous Substances Data) |
| Hazard Information | Back Directory | [General Description]
Odorless white solid. Sinks in water. | [Reactivity Profile]
BERYLLIUM OXIDE(1304-56-9) is incompatible with the following: Acids, caustics, chlorinated hydrocarbons, oxidizers, molten lithium, magnesium . | [Air & Water Reactions]
The amount of heat generated by hydrolysis may be large. | [Hazard]
Highly toxic by inhalation. Keep container
tightly closed and flush out after use.
| [Health Hazard]
Any dramatic, unexplained weight loss should be considered as possible first indication of beryllium disease. Other symptoms include anorexia, fatigue, weakness, malaise. Inhalation causes pneumonitis, nasopharyngitis, tracheobronchitis, dyspnea, chronic cough. Contact with dust causes conjunctival inflammation of eyes and irritation of skin. | [Fire Hazard]
Special Hazards of Combustion Products: Toxic beryllium oxide fume may form in fire. | [Description]
Beryllium oxide
(BeO) is formed by the ignition of beryllium metal in an oxygen atmosphere. The resulting solid is colourless
and insoluble in water. | [Physical properties]
Beryllium oxide (BeO) is a white crystalline oxide. It occurs in nature as the mineral “Bromellite”. Historically, beryllium oxide was called glucina or glucinium oxide. It is an electrical insulator and its thermal conductivity is such that it is higher than any other nonmetal except diamond, and actually exceeds that of some metals. Its high melting point leads to its use as a refractory.
| [Definition]
ChEBI: A beryllium molecular entity consisting of beryllium (+2 oxidation state) and oxide in the ratio 1:1. In the solid state, BeO adopts the hexagonal wurtzite structure form while in the vapour phase, it is present as discrete diatomic covalent molecules. | [Preparation]
Beryllium oxide can be prepared by calcining beryllium carbonate, dehydrating the hydroxide or igniting the metal with oxygen gas, as shown in the following reactions:
BeCO3→BeO＋CO2
Be(OH)2→BeO＋H2O
2Be＋O2→2BeO
Igniting beryllium in air | [Production Methods]
Single crystals are grown by hydrothermal synthesis using Beryllium oxide and NaOH solution, but the size smaller than 0.6 mm is only obtained. The pressed plate (thickness of 0.3–1.0 mm) has the density of 99.5% of a single crystal and has the transmittance almost same as the single crystal.
| [Industrial uses]
A colorless to white crystalline powder of the composition beryllium oxide, also called beryllia. It has a specific gravity of 3.025, a high melting point, about 2585 C, and a Knoop hardness of 2000. It is used for polishing hard metals and for making hot-pressed ceramic parts. Its high heat resistance and thermal conductivity make it useful for crucibles, and its high dielectric strength makes it suitable for high-frequency insulators. Single-crystal beryllia fibers, or whiskers, have a tensile strength above 6800 MPa.
Beryllium oxide is tapped for nuclear reactor service because of its refractoriness, high thermal conductivity, and ability to moderate (slow down) fast neutrons. The thermal neutrons that result are more efficient in causing fusion of uranium- 235. Nuclear industry uses for beryllia include reflectors and the matrix material for fuel elements. When mixed with suitable nuclear poisons, beryllium oxide may be a new candidate for shielding and control rod assembly applications. | [Safety Profile]
Confirmed carcinogen withexperimental tumorigenic data. Experimental teratogenicdata. Other experimental reproductive effects. Incompatible with (Mg +heat). When heated to decomposition it emits very toxicfumes of BeO. | [Structure and conformation]
The space lattice of Beryllium oxide belongs to the hexagonal system with lattice constants a=0.2698 nm and c=0.4380 nm.
|
| Questions And Answer | Back Directory | [Uses]
Beryllium oxide (BeO) is a beryllium compound produced in significant commercial quantities.
The chemical process starts with minerals containing aluminum silicate and silicon
dioxide and undergoes a number of chemical reactions, some at high temperatures, to end
up with BeO. |
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