Refractory Technology
High porosity refractory bricks have

Poor resistance to the peneration of molten slag, metal & flue gases
All of these
Better thermal spalling resistance
Poor heat conductivity & low strength

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Refractory Technology
Natural silica

All of these
Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes
Is not stable at high temperature
Mainly contains quartz

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Refractory Technology
Tar bonded dolomite bricks

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

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