Correct Answer - Option 1 :
High temperature
Refractory bricks:
These are made from fire-clay, using the same process as an ordinary clay. They are yellowish or light brown coloured brick.
It is made up of materials which have high melting points and have properties which make them suitable to act as heat resisting barriers between high and low-temperature zones
Water absorption varies from 4-10 % and the compressive strength lies b/w 15 - 20 N/mm2.
It is generally used for the lining blast furnaces, Ovens, Kiln, Boilers and Chimneys.
Important point:
Type of Refractory Bricks
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Examples
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Acid Refractory Bricks
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Silica bricks and Gannister bricks
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Basic Refractory Bricks
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Magnesia bricks and bauxite bricks
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Neutral Refractory Bricks
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Chromite Bricks, Chrome Magnesite and Forsterite bricks.
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