Correct Answer - Option 4 : Steatic
Concept:
Porcelain:
The term porcelain is used to indicate fine earthenware which is white thin and semi-transparent. Since the colour of porcelain is white, it is also referred to as whiteware. The clay of sufficient purity and possessing a high degree of tenacity and plasticity is used in preparing porcelain. It is hard, brittle, and non-porous. It is prepared from clay, felspar.
Properties and uses of different types of porcelain:
S. No.
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Name
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Properties
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Uses
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1.
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Steatic porcelain
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It contains 70% to 90% silicate of magnesia.
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It is used as an electrical insulator for high magnesia. intensity electric current, vacuum tubes, etc.
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2.
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Carbon and graphite
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It is a refractory material of high quality. But it is oxidized at high temperatures.
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It is used for making electrodes and in the. construction of atomic reactor rockets
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3.
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Cordierite porcelain
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It contains 22% alumina, 35%, clay, and 43% silicate of magnesia. It is available in porous, partly porous, and glassy forms.
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It is used for electric furnaces, refractory bricks, etc.
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4.
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Zircon porcelain
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It contains 45 to 60% zircon, 15 to 30% clay, and 15 to 30%
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It is used in the manufacture of spark plugs.
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