Aluminum oxide (Al2O3) is the technically most important oxide ceramic material with the widest utility. Densely sintered aluminum oxide distinguishes itself by:

• high strength and rigidity
• temperature stability
• high resistance to wear and corrosion even at high temperatures
• Depending on the content, very fine (< 1µm)
• to coarse grain structure
• good heat conductivity
• high dielectric strength

In use, these synthetically produced materials with 80% to 99.99% aluminum oxide content have stood the test. The choice of material depends on technical and economic criteria.

The Kerafol company has specialized in substrate material containing more than 99.4% Al₂O₃. Here both dense and porous materials are available.