| Property | Unit | Value |
|---|---|---|
| Lattice constant | micro; m | a:2.504×10-10 c:6.692×10-10 |
| Apparent density | g/cm3 | 2.0 -2.21(board) 2.0 -2.17(crucible) |
| Helium transmissivity | cm3/S | 1×10-12 |
| Solidity by microscope | N/mm2 | 691.88 |
| Volume resistivity | Ω·cm | 3.11×1011 |
| Tensile strength | (Strength “C”)N/mm2 | 153.86 |
| Bending strength | (Strength “C”)N/mm2 , a: | 243.63 |
| (Strength⊥“C”)N/mm2 , c: | 197.76 | |
| Elasticity modulus | N/mm2 | 235690 |
| Pyroconductivity | W/m·k | “a” direction “c“ direction |
| W/m·k (200°) | 60 2.60 | |
| W/m·k (900°) | 43.70 2.80 | |
| Dielectric strength (room temperature) | KV/mm | 56 |
| Purity | ％ | 99.99-99.999/td> |
