LIGHTWEIGHT GYPSUM BOARDS WITH REDUCED DENSITY AND INSTALLED FIRE RESISTANCE DEGREE Russian patent published in 2015 - IPC E04B1/88 C04B28/14 C04B38/08 

FIELD: construction.

SUBSTANCE: invention relates to gypsum boards with reduced weight and reduced density. A fire-resistant gypsum board includes an intermediate gypsum layer located between two facing sheets, with that, the intermediate gypsum layer includes a crystalline matrix of hardened gypsum and particles with high expansion coefficient, which are capable of being expanded to approximately 300% or more relative to their initial volume after heating during approximately one hour at the temperature of approximately 1560°F (approximately 850°C), has density (D) of approximately 40 pounds per cubic feet (approximately 640 kg/m³) or less and hardness of the intermediate layer, which comprises at least approximately 11 pounds (approximately 5 kg), with that, heat insulation parameter of the board (TI) comprises approximately 20 minutes or more.

EFFECT: improvement of heat-insulating properties, resistance to thermal shrinkage and improvement of fire resistance.

30 cl, 22 tbl