Rockwool Sound Insulation products are made from stone, with a non-directional fibre orientation that traps sound waves, and deadens vibration. The slabs are also fire resistant, able to resist temperatures of over 1,000C. Length: 1200 mm Width: 600 mm Thickness: 50 mm Material: Stone Wool Usage: Sound Proofing Fire Retardant: Euroclass A1 Pack Quantity: 12 Coverage: 4.32 m2 Thermal Conductivity: 0.038 W/mK Type: Insulation Slabs Certifications Met: BS EN 13162 Thermal Resistance R Value: 1.32 m2K/W Manufacturer Model No: 180885 Country Origin: UK Brand Name: Rockwool