Refractory Technology
Spalling resistance of a refractory can not be increased by

Making it denser
Using a coarser grog during its manufacture
Increasing its porosity
Decreasing its thermal co-efficient of expansion

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Refractory Technology
Tar bonded dolomite bricks

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

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