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Alumina 98% - 99.8%


98% - 99.8% Al2O3 

Alumina 98-99.8% overview

High purity 98%-99.8% aluminas are used for applications requiring excellent mechanical properties and a high-purity composition in order to minimize contamination.

Example Applications

  • Semiconductor wafer fabrication components
  • Precision measurement components


CoorsTek Formulations

Contact a CoorsTek expert to choose an Alumina 98% - 99.8% solution for your application.

Property Units Value

Flexural Strength, MOR (20 °C)


300 - 550

Fracture Toughness, KIc

MPa m1/2


Thermal Conductivity (20 °C)

W/m K

18.0 - 37.1

Coefficient of Thermal Expansion

1 x 10-6/°C

8.2 - 9.0

Maximum Use Temperature


1400 - 1800

Dielectric Strength (6.35mm)


8.7 - 19.7

Dielectric Loss (tan δ)

1MHz, 25 °C

1 x 10-4 to 4 x 10-4

Volume Resistivity (25°C)


> 1014

The information provided on this chart is for general material property reference only.  The customer should recognize that exact properties of materials may vary according to product configuration but close control of values of most properties can be maintained, if specified. Nothing herein is provided, or is to be construed, as absolute engineering data or constituting a warranty or representation. Contact CoorsTek for cost-effective design, development and manufacturing assistance. CoorsTek has 300+ variations including various forming and firing processes, not all variants are represented in the present website.

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