Thermal Resistance:1.14m2K/w Bending Resistance(Dry):Less than 18Mpa Bending Resistance(Fully Absorbed in Water):Less than 22Mpa Sound insulation:more than 44dB Absorption Moisture:Less than 15% Tensile Strength:Less than 8-13Mpa Impact Resistance:Between 2.0-2.5 are qualif led,for 4mm,our board could reach 4.5kj/m2,so our boards are good Thickness:3-20mm Specification:1220*2440mm;1200*2700mm,1200*3000mm Color:White,grey,green and red Density:0.96-1.12g/cm3 Fire ratings:grade a1 More:www.fireproof-board.com