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Aluminum oxide

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Aluminum oxide
Aluminum oxide
Other names alumina
aluminium(III) oxide
Molecular formula Al2O3
Molar mass Molar mass::101.96 g/mol
CAS number CAS number::1344-28-1
Solubility in water insoluble
Melting point Melting point::2054 °C
Boiling point Boiling point::3000 °C
Thermal Conductivity 18 W m−1 K−1
Crystal structure cubic
Thermodynamic data
Standard enthalpy
of formation
−1675.7 kJ mol−1
Standard molar entropy
50.92 J mol−1 K−1
Heat capacity Cp 79.04 J mol−1 K−1
MSDS External MSDS
NFPA 704

NFPA 704 svg.png

Flash point non-flammable
Related compounds
Other anions aluminium hydroxide
Other cations

boron trioxide
gallium oxide
indium oxide
thallium oxide

Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Disclaimer and references

Aluminum Oxide is a chemical compound consisting of two aluminum ions and three oxygen ions demonstrated by the formula Al2O3 Another commons name for aluminum oxide is aluminium oxide which is its proper name. It may also be referred to as aloxide, aloxite, or alundum. It is most frequently found in a crystalline polymorphic phase which s comprised of the mineral corundum which helps form several precious stones such as rubies and sapphires. Aluminum oxide is very commonly used in industry to produce aluminum metal because of its hardness, and high melting point.


Aluminum oxide is also a electrical insulator because of it's high thermal conductivity (about 30 Wm K-1) Aluminum oxide s also completely insoluble in water. It is also commonly used as an industrial abrasive material for cutting tools.

Aluminum oxide is responsible for the resistance of metallic aluminium to weathering. It also is very reactive with atmospheric oxygen because of its thin passivation layer. Aluminum oxide is often used to enhance metals and prevent rusting especially in bronze. The structure of aluminum oxide is amorphous, but several reactions such as plasma electrolytic oxidation will make it harder. This compound is an amphoteric substance meaning that it can react with both acids and bases acting as an acid with a base and a base with an acid neutralizing the other ion and producing a salt.



Oxide is mined up from the earth. Corundum is the most common occurring crystalline form of aluminum oxide. Corundum can also be found in higher quality forms that compose rubies and sapphires. The red in a ruby owes its color to traces of aluminum oxide. Likewise, sapphires occur in various colors depending on the varying amounts of impurities from other substances such as iron or titanium.


Aluminum Oxide can be used in the making of ceramics. It is very useful when you are making ceramics because it has good mechanical strength, heat conductivity, fire resistant, corrosion and wear resistance, sliding properties, and it is a good electric insulation. Those properties do not relate to all of the ceramics that are created from aluminum oxide. Aluminum oxide can be mined and sometimes it is used as a natural abrasive so most emery boards are made from aluminum oxide, also a lot of sandpaper is made from Aluminum Oxide. It is also used in the coating of compact fluorescent lamps. Microdermabrasion uses aluminum oxide crystals. Aluminum oxide can be found as a crystal which is called corundum.


Related References