FIELD: manufacturing technology.
SUBSTANCE: disclosed is a gypsum composition for an air-hardening material which, when converted to a gypsum-based coating material by water addition, can form a coating layer. Gypsum composition for the air-hardening curing material contains semi-aqueous gypsum with an average particle diameter of 50 mcm or less, calcium carbonate with an average particle diameter of 50 mcm or less and a setting retarder, wherein content of calcium carbonate in composition is from 100 to 400 weight parts, and content of retarder of setting is 0.1 weight parts or more, relative to 100 weight parts of semi-aqua gypsum.
EFFECT: formation of coating layer, in which non-uniformity of coloring is suppressed, even if cover layer is thin and smooth.
16 cl, 2 dwg, 4 tbl
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