Alumina

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A drying agent. One of the most absorbent substances on earth.

Alumina (Wikipedia)
This article is about aluminium(III) oxide, Al2O3. For other uses, see Aluminium oxide (compounds).
Aluminium oxide
Corundum-3D-balls.png
Aluminium oxide2.jpg
Identifiers
1344-28-1 YesY
ChemSpider 8164808 YesY
Jmol 3D image Interactive graph
Interactive graph
PubChem 9989226
RTECS number BD120000
UNII LMI26O6933 YesY
Properties
Al2O3
Molar mass 101.96 g·mol−1
Appearance white solid
Odor odorless
Density 3.95–4.1 g/cm3
Melting point 2,072 °C (3,762 °F; 2,345 K)
Boiling point 2,977 °C (5,391 °F; 3,250 K)
insoluble
Solubility insoluble in diethyl ether
practically insoluble in ethanol
Thermal conductivity 30 W·m−1·K−1
nω=1.768–1.772
nε=1.760–1.763
Birefringence 0.008
Structure
Trigonal, hR30, space group = R3c, No. 167
a = 478.5 pm, c = 1299.1 pm
octahedral
Thermochemistry
50.92 J·mol−1·K−1
−1675.7 kJ·mol−1
Pharmacology
D10AX04 (WHO)
Hazards
Safety data sheet See: data page
Not listed.
NFPA 704
Flammability code 0: Will not burn. E.g., waterHealth code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Flash point Non-flammable
US health exposure limits (NIOSH):
PEL (Permissible)
OSHA 15 mg/m3 (Total Dust)
OSHA 5 mg/m3 (Respirable Fraction)
ACGIH/TLV 10 mg/m3
REL (Recommended)
none
IDLH (Immediate danger)
N.D.
Related compounds
Other anions
aluminium hydroxide
Other cations
boron trioxide
gallium oxide
indium oxide
thallium oxide
Supplementary data page
Refractive index (n),
Dielectric constantr), etc.
Thermodynamic
data
Phase behaviour
solid–liquid–gas
UV, IR, NMR, MS
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Infobox references

Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al2O3. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide. It is commonly called alumina, and may also be called aloxide, aloxite, or alundum depending on particular forms or applications. It occurs naturally in its crystalline polymorphic phase α-Al2O3 as the mineral corundum, varieties of which form the precious gemstones ruby and sapphire. Al2O3 is significant in its use to produce aluminium metal, as an abrasive owing to its hardness, and as a refractory material owing to its high melting point.

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