Joint material based on gypsum. It is used for filling joints of plasterboards, either with tapered edges (AK) or with tapered and semi-rounded edges (HRAK) and definitely with the use of joint tape. It is also used for gluing plasterboards on flat surfaces, for repairing damaged plasterboards, for bonding and spatulaing gypsum bricks, and for filling joints of prefabricated concrete and lightweight concrete elements.