Manufacturers in China (for reference only)
Alumina Ceramic Material Quality Certificate
| Material材料 | Alumina氧化铝 | ||
| Properties 性能 | 单位（计量） | AL2O3 99.5% | AL2O3 95% |
| Color颜色 | Lvory | White | |
| Permeability渗透性 | Gas-tight | Gas-tight | |
| Density密度 | g/cm3 | 3.9 | 3.7 |
| Straightness 直线度 | % | 1 | 1 |
| Hardness 硬度 | Mohs Scale | 9 | 8.8 |
| Water Absorption 吸水率 | % | ≤0.2 | ≤0.2 |
| Bending Strengh（Typical 20°C ）抗弯强度 | Mpa | 370 | 304 |
| Compressive Strengh（Typical 20°C ） 抗压强度 | Mpa | 2300 | 1910 |
| Max Working Temperature最高使用温度 | °C | 1750 | 1500 |
| Coefficieng of Thermal Expansion（25°C to 800°C）热膨胀系数 | 10-6 /°C
|
7.8 | 7.5 |
| Fracture Toughness断裂韧性 | MPa m1/2 | 4.4 | 3.8 |
| Dielectric Strength（5mm Thickness）介电强度 | AC-kV/mm | 8.7 | 8.3 |
| Dielectric Loss（25°C@1MHz）介电损耗 | <0.0001 | < 0.0002 | |
| Dielectric Constant介电常数 | 25°C@1MHz | 9.7 | 9.2 |
| Electrical Resistivity（25°C）电阻系数 | Ω*mm2/m | ＞1014 | ＞1014 |
| Thermal Conductivity（25°C）热导率 | W/mK | 30 | 25 |