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______ porcelain contains 70% to 90% silicate of magnesia
1. Cordierite
2. Zircon
3. Carbon and graphite
4. Steatic

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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.

Name

Properties

Uses

1.

Steatic porcelain

It contains 70% to 90% silicate of magnesia.

It is used as an electrical insulator for high magnesia. intensity electric current, vacuum tubes, etc.

2.

Carbon and graphite

It is a refractory material of high quality. But it is oxidized at high temperatures.

It is used for making electrodes and in the. construction of atomic reactor rockets

3.

Cordierite porcelain

It contains 22% alumina, 35%, clay, and 43% silicate of magnesia. It is available in porous, partly porous, and glassy forms.

It is used for electric furnaces, refractory bricks, etc.

4.

Zircon porcelain

It contains 45 to 60% zircon, 15 to 30% clay, and 15 to 30%

It is used in the manufacture of spark plugs.

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