Home 		Materials - 99.8% Alumina
The following data sheet provides values for Cerama-Tech Pty Ltd 99.8% alumina ceramic. These properties are indicative only and are strongly dependent on a number of factors. When designing machine parts, the brittle nature of ceramic materials must be taken into consideration.
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Physical Property

  
   Materials
Ultimate Crystal Size (average)

Water Absorption

Apparent Porosity

Density

 1.5 micron

0%

<1%

3.9 gcm-3
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Mechanical Properties

  
Young’s Modulus

Strength – Bending*

Strength – Tensile*

Strength – Compressive*

Hardness - Moh’s

                    - Knoop HK0.05

                    - Vickers HV0.1

 380-400 GPa

400 MPa

260 MPa

3,200 MPa

9+

2030

1900
Thermal Properties

  
Thermal Expansion (25 – 500°C)

Thermal Conductivity (25°C)

 7.5 10-6.K-1

35W.m-1K-1
Electrical Properties

  
Dielectric Breakdown Strength

Minimum Resistivity 20°C (IEC 672, dc)

                                      200°C

                                      600°C

 17kVmm-1

12 log10 Ωm

10 log10 Ωm

6 log10 Ωm
* These figures relate to short-term strength. Long-term stresses will yield very different results.

© Cerama-Tech pty ltd / Industrial Ceramic Solutions 2001