Which one of the following is a neutral refractory?

Ceramic materials are brittle, hard, strong in compression, and weak in shearing and tension. They withstand the chemical erosion that occurs in other materials subjected to acidic or caustic environments. Ceramics generally can withstand very high temperatures, ranging from 1,000 °C to 1,600 °C (1,800 °F to 3,000 °F). Ceramics are made by mixing clay, earthen elements, powders, and water, and then shaping them into the desired form. The ceramic is then fired in a high-temperature oven, or kiln. Ceramics are often covered in glazes, which are decorative, waterproof, paint-like... Show more

Ceramic materials are brittle, hard, strong in compression, and weak in shearing and tension. They withstand the chemical erosion that occurs in other materials subjected to acidic or caustic environments. Ceramics generally can withstand very high temperatures, ranging from 1,000 °C to 1,600 °C (1,800 °F to 3,000 °F).

Ceramics are made by mixing clay, earthen elements, powders, and water, and then shaping them into the desired form. The ceramic is then fired in a high-temperature oven, or kiln. Ceramics are often covered in glazes, which are decorative, waterproof, paint-like substances.

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