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ALUMINA
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Aluminium oxide (Al₂O₃) is the most popular technical ceramic in use today, offering unbeaten price-to-performance characteristics in a wide range of application areas. The appeal of alumina largely stems from its extreme versatility. Ceramic engineers can finely moderate both the chemical and thermomechanical properties of alumina ceramics using a choice of additives and bonding techniques. Different types of alumina are consequently characterized mainly by purity.

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International Syalons is one of the UK’s foremost technical ceramics suppliers and manufacturers, offering a suite of high-purity alumina ceramics. Purity in this context refers to the concentration of Al₂O₃ in the finished part, with greater purities translating to superior corrosion-resistant and wear-resistant behaviour. Our alumina products are based on 95 – 99.9% pure aluminium oxide in a fully densified configuration. Typical performance characteristics include:

- Good flexural strength (500 MPa)
- High density (3.95 g/cc)
- Excellent electrical resistivity (1050 Ω cm)
- Extremely high hardness (1800 Kg/mm2)
- High operating temperature capabilities (max 1700°C)

Browse our alumina products below for full specifications and datasheets.

alumina crucibles
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Aluminon 96

Aluminon 96 is fully dense and suitable for wear and corrosion resistant applications. The table below lists typical mechanical, thermal and electrical property data for Aluminon 96.

Aluminon 96 - Physical Property Data

PROPERTY
VALUE
UNITS
Composition
96% Al₂O₃
-
Density
3.75
g/cc
Porosity
0
%
3-point MOR at 20°C ⁺
300
MPa
3-point MOR at 1000°C ⁺
200
MPa
Weibull Modulus
10
-
Compressive Strength
>2000
MPa
Young's Modulus
330
GPa
Poisson's Ratio
0.22
-
Hardness (HR45N)
83
-
Hardness (Vickers Hv50)
15.71 (1600)
GPa (Kg/mm²)
Fracture Toughness (K₁c)
3.5
MPa m½
Thermal Expansion Coefficient
7.0x10⁻⁶
K⁻¹
Thermal Conductivity
20
W/(mK)
Thermal Shock Resistance ⁺⁺
200
ΔT°C
Maximum Use Temperature
1600
°C
Electrical Resistivity
10¹⁵
Ω cm
⁺ Modulus of rupture specimen 3 × 3 × 50mm, span 19.05mm
⁺⁺ Quenched into cold water
Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.
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Aluminon 995

Aluminon 995 is fully dense and has excellent corrosion resistance. In addition, it has excellent thermal stability up to 1700°C and can be used as noble metal thermocouple protection tubes. The table below lists typical mechanical, thermal and electrical property data for Aluminon 995.

Aluminon 995 - Physical Property Data

PROPERTY
VALUE
UNITS
Composition
99.5% Al₂O₃
-
Density
3.89
g/cc
Porosity
0
%
3-point MOR at 20°C ⁺
330
MPa
3-point MOR at 1000°C ⁺
250
MPa
Weibull Modulus
15
-
Compressive Strength
>2000
MPa
Young's Modulus
370
GPa
Poisson's Ratio
0.22
-
Hardness (HR45N)
82
-
Hardness (Vickers Hv50)
15.71 (1600)
GPa (Kg/mm²)
Fracture Toughness (K₁c)
4.0
MPa m½
Thermal Expansion Coefficient
7.8x10⁻⁶
K⁻¹
Thermal Conductivity
30
W/(mK)
Thermal Shock Resistance ⁺⁺
200
ΔT°C
Maximum Use Temperature
1700
°C
Electrical Resistivity
10¹⁵
Ω cm
⁺ Modulus of rupture specimen 3 × 3 × 50mm, span 19.05mm
⁺⁺ Quenched into cold water
Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.
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Aluminon 999

Aluminon 999 is a very high purity material with excellent mechanical, thermal and corrosion resistant properties. It is the most stable of our aluminas and is suitable for severe wear and corrosion applications. The table below lists typical mechanical, thermal and electrical property data for Aluminon 999.

Aluminon 995 - Physical Property Data

PROPERTY
VALUE
UNITS
Composition
99.9% Al₂O₃
-
Density
3.95
g/cc
Porosity
0
%
3-point MOR at 20°C ⁺
500
MPa
3-point MOR at 1000°C ⁺
300
MPa
Weibull Modulus
15
-
Compressive Strength
>2500
MPa
Young's Modulus
400
GPa
Poisson's Ratio
0.22
-
Hardness (HR45N)
92
-
Hardness (Vickers Hv50)
17.65 (1800)
GPa (Kg/mm²)
Fracture Toughness (K₁c)
4.5
MPa m½
Thermal Expansion Coefficient
8.5x10⁻⁶
K⁻¹
Thermal Conductivity
30
W/(mK)
Thermal Shock Resistance ⁺⁺
220
ΔT°C
Maximum Use Temperature
1700
°C
Electrical Resistivity
10¹⁵
Ω cm
⁺ Modulus of rupture specimen 3 × 3 × 50mm, span 19.05mm
⁺⁺ Quenched into cold water
Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.
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alumina crucible

The successful integration of advanced technical ceramics into engineering systems requires close collaboration between you, the end-user, and ourselves, the material manufacturer. Please call +44(0)191 2951010 or email for an initial consultation with our technical sales team, or send us a Request for Quote.

In addition, see our resources section for guides on designing with ceramics and more property data comparing alumina with other engineering ceramics. For a comparison of the physical properties of all our materials see our Material Properties Datasheet.