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FOTMA
| Quantity: | |
|---|---|
| Material | Unit | High purity corundum | Corundum | High aluminum |
| Item | ||||
| Al2O3 content | % | 99.7 | 99.3 | 85 |
| SiO2content | % | ＜0.1 | - | - |
| Density | g/cm3 | 3.95 | 3.88 | 3.2 |
| Water absorption | % | 0 | 0.01 | 0.2 |
| Room temperature withstand voltage | Mpa | 450 | 350 | 200 |
| 20°C leak rate | Torr/L.sec | <10-11 | <10-11 | <10-11 |
| High temperature bending | mm | 1700°C 0.2mm allowed | 1700°C 0.2mm allowed | 1700°C 0.2mm allowed |
| High temperature bonding | | 1700°C No bonding | 1600°C No bonding | 1400°C No bonding |
| 20~1000°C thermal expansion coefficient | mm.10-6/°C.m | 8.6 | 8.2 | 8.2 |
| Thermal conductivity | W/m.K | 25 | 25 | 10 |
| Electrical insulation strength | KV/mm | 20 | 20 | 15 |
| 20°C DC insulation resistance | Ohm/cm | 1014 | 1014 | 1014 |
| High temperature insulation resistance | 1000°C MΩ | ≥0.08 | ≥0.08 | ≥0.08 |
| ≥0.02 | ≥0.02 | ≥0.02 | ≥0.02 | |
| Resistant to rapid cold and heat | - | 1550°C 6 times without cracking | 1550°C 6 times without cracking | 1550°C 6 times without cracking |
| Maximum use temperature | °C | 1900 | 1800 | 1400 |
| Maximum length of ceramic tube | mm | 1600 | 1600 | 1600 |
| Material | Unit | High purity corundum | Corundum | High aluminum |
| Item | ||||
| Al2O3 content | % | 99.7 | 99.3 | 85 |
| SiO2content | % | ＜0.1 | - | - |
| Density | g/cm3 | 3.95 | 3.88 | 3.2 |
| Water absorption | % | 0 | 0.01 | 0.2 |
| Room temperature withstand voltage | Mpa | 450 | 350 | 200 |
| 20°C leak rate | Torr/L.sec | <10-11 | <10-11 | <10-11 |
| High temperature bending | mm | 1700°C 0.2mm allowed | 1700°C 0.2mm allowed | 1700°C 0.2mm allowed |
| High temperature bonding | | 1700°C No bonding | 1600°C No bonding | 1400°C No bonding |
| 20~1000°C thermal expansion coefficient | mm.10-6/°C.m | 8.6 | 8.2 | 8.2 |
| Thermal conductivity | W/m.K | 25 | 25 | 10 |
| Electrical insulation strength | KV/mm | 20 | 20 | 15 |
| 20°C DC insulation resistance | Ohm/cm | 1014 | 1014 | 1014 |
| High temperature insulation resistance | 1000°C MΩ | ≥0.08 | ≥0.08 | ≥0.08 |
| ≥0.02 | ≥0.02 | ≥0.02 | ≥0.02 | |
| Resistant to rapid cold and heat | - | 1550°C 6 times without cracking | 1550°C 6 times without cracking | 1550°C 6 times without cracking |
| Maximum use temperature | °C | 1900 | 1800 | 1400 |
| Maximum length of ceramic tube | mm | 1600 | 1600 | 1600 |
