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Photos 1 Aluminium Oxide Ceramic Bead’s Parameters and Uses 
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Aluminium Oxide Ceramic Bead is a device used to preheat and postheat after eliminating the stress in the welding process in the heating of ceramic gasket and pipeline. It is used in the welding field with high requirements such as shipbuilding.
| Performance | Parameter |
| Bulk density | g/ cm3> 3.50 |
| Flexural strength | (MPa) 304 |
| Coefficient of linear expansion | 20~800°C x10-6/°C 6.5~8.0 |
| Dielectric constant | 1MHz 9~10 10GHz 9~10 |
| Dielectric loss | 1MHz×10-6≤4 10GHz×10-6≤10 |
| Specific volume resistance | 100°CΩ•Cm＞1013 |
| Breakdown strength | KV/mm 15 |
| Thermal conductivity | 20°C W/m•k 25.5 |
