– a product of roasting of natural plaster at temperature 120-170 Celsius degree. In building apply in the form of a powder of a thin grinding.

Acoustic materials

– the materials applied to protection against noise in designs of buildings of different function. Are subdivided on sound-proof and sound-proof. Are made in the form of floor-mats, plates, blocks, cotton wool or loose substances (haydite, Circulite).


– ability of coupling of two diverse bodies at molecular level.