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Q: The hard ceramic material (usually grey or brownish in colour) that is made from refractory clay, mixed with crushed pottery, stones and sand, burnt at high temperature and then cooled slowly is called :
  • A. encaustic tiles
  • B. terracotta
  • C. earthenware
  • D. stoneware
Correct Answer: Option D - Stoneware– A hard ceramic material resembling porcelain with a different colour, usually grey or brownish is made from refractory clay mixed with crushed pottery, stones and said burned at high temperatures and cooled slowly. The clay used for making stoneware consists of about 75 percent silica and 25 percent alumina. Iron oxide is added to give colour. • It is good finish and appearance. • It is hard, compact, strong and durable material. Used– Light sanitary wares (wash basin, water closet), drain pipe and fitting.
D. Stoneware– A hard ceramic material resembling porcelain with a different colour, usually grey or brownish is made from refractory clay mixed with crushed pottery, stones and said burned at high temperatures and cooled slowly. The clay used for making stoneware consists of about 75 percent silica and 25 percent alumina. Iron oxide is added to give colour. • It is good finish and appearance. • It is hard, compact, strong and durable material. Used– Light sanitary wares (wash basin, water closet), drain pipe and fitting.

Explanations:

Stoneware– A hard ceramic material resembling porcelain with a different colour, usually grey or brownish is made from refractory clay mixed with crushed pottery, stones and said burned at high temperatures and cooled slowly. The clay used for making stoneware consists of about 75 percent silica and 25 percent alumina. Iron oxide is added to give colour. • It is good finish and appearance. • It is hard, compact, strong and durable material. Used– Light sanitary wares (wash basin, water closet), drain pipe and fitting.