Roxul - Rockwool insulation Thickness 50mm Size : 1.2 Mtr x 7.5 Mtr Brand Roxul WORKING TEMPERATURE Fiber : Up to 750 °C Facing : 100 °C At temperatures in excess of 230 °C a limited migration of binder may occur in the insulation in contact with the hot face. This does not impair the insulation performance. ACOUSTIC PERFORMANCE ROCKINSUL RB Slabs achieve excellent acoustic performances (sound absorption coefficients, sound insulation, and impact sound isolation) when tested in accordance to various relevant ASTM standards. RB Slabs achieve Noise Reduction Coefficient (NRC) values up to 1, when tested in accordance to ASTM C423.