FIELD: chemistry.
SUBSTANCE: invention relates to a composite gypsum panel. Panel comprises at least one layer of hardened gypsum located between front and back cover sheets. Layers of hardened gypsum are formed from at least plaster and water. Plaster material, as a rule, has a high content of salt impurities, for example, when plaster is calcined from certain sources of low-quality synthetic gypsum. For example, in some embodiments, the salts are chlorides, for example sodium chloride (NaCl), potassium chloride (KCl), magnesium chloride (MgCl2) and/or calcium chloride (CaCl2).
EFFECT: panel provides bonding between layer(s) of gypsum and at least one of cover sheets, for example back cover sheet.
7 cl, 26 dwg, 13 tbl
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