It has been discussed that earthenware is manufactured from ordinary clay burnt at low temperatures. Sometimes the clay is mixed with sand, crushed pottery, etc. Earthenware are susceptible to damage by atmospheric action since they are soft and porous. In general, they should not absorb more than about 20% of water by weight. In order to make them impervious, they may be glazed.
Glazed earthenware tiles are used for floors and walls of kitchens, bathrooms, water closets, hospitals, etc.
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