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99.99% Al₂O₃ ceramics, due to their extremely high purity, exhibit a translucent state with a transmission wavelength range of 1 to 6 micrometers. These ceramics are commonly fabricated into molten glass as a substitute for platinum crucibles. Their optical transparency and resistance to alkali metal corrosion make them ideal materials for sodium lamp envelopes. Additionally, in the electronics industry, they serve as substrates for integrated circuits and as high-frequency insulating materials
The Performance and Properties of Sapphire (99.99% Alumina):
| Characteristics | Value | Characteristics | Value |
| Chemical Formula | 99.99% | Crystal structure | a=4.785，c=12.991Ã |
| Sintered Density | 3.98 g/cm³ | Permeability | 0 |
| Water Absorption | 0 | Crystal Structure | Hexagonal |
| Hardness, Mohs | 9 | Vickers Hardness | 1900 |
| Tensile Modulus |
400 Mpa (25℃) 350 Mpa（1000℃） |
Flexural Strength | 600 MPa （25℃） |
| Compressive modulus | 380 GPa(25℃) | Compressive Strength | 2600 MPa（25℃） |
| Rigidity modulus | 150 Gpa（25℃) | Flexural modulus | 360 GPa(25℃) |
| Poissons Ratio | 0.29 | Bulk modulus | 24O GPa （25℃） |
| Frictional coefficient | 0.1 | Melting point | 2045℃ |
| Volume Resistivity | 1.00×10¹⁴ ohm·cm (20.0 °C) | Dielectric Constant (1e+6 Hz) | 11.5(//c),9.3(Lc) |
| Dielectric strength | 480kVcm-1(60Hz） | Dielectric Loss Index |
0.00006 //c (10 GHz) 0.00003 ⊥c (10 GHz) |
| CTE, linear (20.0-400°C) | 5.8μm/(m⋅°C) | CTE, linear (20.0-1000°C) | 8.20-9.00 µm/m·°C |
|
Specific Heat Capacity （25℃，1000℃） |
6.481 J/(g·°C) 10.451 J/(g·°C) |
Thermal Conductivity | 25.12 W/m·K |
| Max. Service Temp. Air | 2000°C | Fraction |
no=1.768 ne=1.760 |
| Optical transmission | 0.3 ~ 5 μm | Reflection loss | 0.2 |
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