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| Item | HN 850A | HN 920A | HN 960A | |
|---|---|---|---|---|
| Cgenucak Compisition | % | Al2O3 85.0 |
Al2O3 92.0 |
Al2O3 96.0 |
| Specific Gravity | - | 3.45 | 3.60 | 3.72 |
| Water Absorption | % | 0 | 0 | 0 |
| Hardness | MOHS | 9.0 | 9.0 | 9.0 |
| ROCKWELL[HRa] | 85 | 86 | 88 | |
| Compressive Strength[25℃] | kgf/㎠ | 19,500 | 22,000 | 21,000 |
| Flexural Strength[25℃] | kgf/㎠ | 3,000 | 3,000 | 3,200 |
| Tensile Strength[25℃] | kgf/㎠ | 1,500 | 2,000 | 2,000 |
| Coef. of thermal expansion[20~1000℃] | X10-6/℃ | 7.2 | 8.0 | 8.2 |
| thermal Conductivity[400℃] | Kcal/㎝.sec.℃ | 5.2 | 5.8 | 6.2 |
| Using Temperature | ℃ | 1,450 | 1,500 | 1,650 |
| Volume Resistivity[25℃] | Ω㎠ | 1014 | 1014 | 1014 |
| Dielectric Strength | ac-Kv/㎜ | 13.4 | 12.3 | 10.8 |
| Dielectric Constant[1MHz25℃] | - | 8.2 | 8.9 | 9.0 |
| Dissipation Factor, tan■[1MHz25℃] | - | 0.007 | 0.002 | 0.001 |
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