Alumina of different purities usually have significant differences in performance. Common alumina is 92, 95, 99, 99.5, 99.7 and 99.8%. The increase in purity will make Al2O3 more stable and reliable in more harsh environments. It is often used in the semiconductor and medical industries.
99.8% Alumina Advantages
- Electrical insulation
- High hardness
- Corrosion resistance
- Wear-resistant
- Non-toxic and odorless
- Low coefficient of thermal expansion
Application Cases
Aluminum oxide ceramic arm
It can be used to handle or position sensitive materials in semiconductor manufacturing, providing excellent insulation and thermal stability.
Alumina valve core
Alumina ceramic valve core is used to control fluid and replace traditional metal parts in high pressure, corrosion, high temperature and high cleanliness scenes.
Alumina winding column
Used in the electronics industry to fix wires in circuit breakers and insulators and withstand high voltage shocks (such as power transmission and distribution systems)
Material Properties
| Test item | Test Results |
| Volume density (g/cm³) | 3.925 |
| Volume resistivity (Ω·cm) | 2.7×10¹⁴ |
| Permittivity (1MHz) | 9.28 |
| Loss tangent (1MHz) | 0.0122 |
| Electric strength (kV/mm) | 14.7 |
| Thermal conductivity (W/(m·K)) | 30.8 |
| Coefficient of linear expansion (CTE, 30°C~300°C, ppm/°C) | 7 |
| Coefficient of linear expansion (CTE, 30°C~500°C, ppm/°C) | 7.6 |
| Flexural strength (MPa) | 416 |
Disclaimer: The values listed are average and typical values of the tested samples. These values are for reference only.
Thermal expansion properties
99.8% Alumina As the temperature increases to 500°C, the CTE increases to 7.653 ppm/°C, which is important for evaluating dimensional stability in high-temperature applications, especially in aerospace, semiconductor and precision optics
Advanced Ceramics Manufacturer
We understand that each industry application has unique requirements, therefore, we offer a wide range of customization options for alumina ceramics to ensure your specific needs are met. If you require alumina rods, tubes, sheets, or custom components, please send us a request using the form below.
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