Gypsum is a subcategory of sedimentary carbonate rocks and hydrous calcium sulfate, which can be obtained both naturally and unnaturally. To obtain plaster, the stone is extracted from the earth's crust by means of stone crushing machines. This extracted gypsum stone has a crystalline texture and consists of thick layers.
To eliminate the crystallization of gypsum stone, after extraction, it is heated in ovens with a temperature of 180 degrees Celsius. This will evaporate the water in the stone and it will be easier to turn it into plaster powder. After the evaporation of water, gypsum stone is obtained with special mills in the form of powder that can be used in construction purposes. The obtained powder particles should be less than 0.15 mm.
To eliminate the crystallization of gypsum stone, after extraction, it is heated in ovens with a temperature of 180 degrees Celsius. This will evaporate the water in the stone and it will be easier to turn it into plaster powder. After the evaporation of water, gypsum stone is obtained with special mills in the form of powder that can be used in construction purposes. The obtained powder particles should be less than 0.15 mm.
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Construction plaster is produced either in the form of whitewash plaster or underwork plaster (soil plaster). The production method of both types of plaster is very similar to each other. The only difference between them is that they use stronger machines and equipment for grinding, grinding and separation to produce white plaster.
The gypsum stone used to produce white plaster has a purity of 98%. White plaster has a higher initial setting and secondary (final) setting time than the plaster under the work and is produced in 40, 60 and 100 meshes.