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

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

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Refractory Technology
Tar bonded dolomite bricks

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

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