There are three types of plaster. Gypsum plaster is made by heating gypsum to a high temperature. Lime plaster is made with limestone. And cement plaster is a mixture of plaster, sand and cement and sometimes gypsum as well. There is some concern about the health hazards of working with plaster and breathing in the dust, especially with variations that contain harmful substances like asbestos or silica. It is also difficult to dispose of, as it can harden and ruin soil or clog pipes.
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