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ROCKWOOL Sound Insulation Slab offers oustanding acoustic and fire protection in internal walls and floors. Euroclass A1 non-combustible - withstands temperatures of over 1,000°C. QuietMarkâ approved - delivering oustanding sound reduction. Patented FLEXI Edge® - delivering the perfect friction fit. CE marked - for quality assurance. The mineral wool insulation is water repellent and moisture permeable, preventing damp, resisting rot and mould. Sustainable & recyclable - manufactured using naturally abundant volcanic rock.