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Apr 30, 2025

Aluminiumoxid Al2O3 Substrates

The materials aluminium oxide Rubalit® and aluminium nitride Alunit® developed by CeramTec have established themselves worldwide as standard materials for electronic circuit carriers and are a byword for quality among all renowned manufacturers of hybrid circuits. They convince with an excellent cost/performance ratio as well as their good thermal conductivity. They are used in industry, vehicle electrification and renewable energies.

Substrates made of Rubalit® Aluminium Oxide Ceramics


New 2025: Rubalit® 798 with 98% Al2O3

Rubalit® 798 impresses with its high strength, high dielectric strength , improved thermal conductivity, specific heat capacity, dielectric constant and low dielectric loss factor. The substrate is ideally suited for the high-frequency range. It will be presented for the first time at the PCIM Expo in Nuremberg.


Rubalit® 708 S with 96% Al2O3

This ceramic material is characterized by its extremely high strength and thermal conductivity. The outstanding surface quality on both sides makes it the perfect companion for any commercial thick film paste and even makes it suitable for a number of thin film applications (sputtering).

Rubalit® 710 with 99.6% Al2O3

With its extremely fine surface quality, this ceramic material is designed especially to meet the highest demands in thin-film technology.

Rubalit® 708 HP – High Performance with 96% Al2O3

Rubalit® 708 HP offers consistently reliable and convincing performance even when subject to high thermal and electrical loads in terms of its:

  • Thermocycling capability
  • Thermal shock resistance
  • Flexural strength
  • Surface quality
  • Thermal conductivity

This makes Rubalit® 708 HP ideal for power electronics in conjunction with direct copper bonding (DCB).


Properties of Alumina/Aluminum Oxide (Al2O3)

  • Very good electrical insulation (1x1014 to 1x1015 Ωcm)
  • Moderate to extremely high mechanical strength (300 to 630 MPa)
  • Very high compressive strength (2,000 to 4,000 MPa)
  • High hardness (15 to 19 GPa)
  • Moderate thermal conductivity (20 to 30 W/mK)
  • High corrosion and wear resistance
  • Good gliding properties
  • Low density (3.75 to 3.95 g/cm3)
  • Operating temperature without mechanical load 1,000 to 1,500°C.
  • Bioinert and food compatible


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