Gyproc Soundbloc is designed for use in British Gypsum wall and partition systems where greater levels of sound insulation are required. Gypsum plasterboard with a higher density core. Gyproc SoundBloc consists of an aerated gypsum core encased in, and firmly bonded to, strong paper liners. Gyproc SoundBloc is a plasterboard that is suitable for drylining internal surfaces. This plasterboard is one of the products within our plasterboard range that is certified to BES 6001 achieving a rating of Very Good. Properties Length: 2400mm Width: 1200mm Thickness: 12.5mm Weight: 10.6kg/m2Facing: Blue paper, brown reverse side paperEdge Type: Tapered Fire Rating: class 1 both sides - BS 476 Thermal Resistance: 0.05 mK/W Thermal Conductivity: 0.25 W/mK