Refractory Technology
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

Fusion point
Thermal conductivity
Electrical conductivity
Cost

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Refractory Technology
Tar bonded dolomite bricks

Are stored under controlled temperature & humidity to avoid hydration
Have poorer hydration resistance than pitch bonded bricks
Are used in outer lining of L.D. converters
All of these

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