Mineral Wool

Mineral wool is a fibrous insulation material made from molten rock (stone wool) or slag, used extensively in acoustic applications for sound absorption and sound insulation. Its interconnected fiber structure provides excellent mid-to-high frequency absorption through viscous air friction, with NRC values typically between 0.80 and 1.00 depending on thickness and density. Mineral wool is the core material in most acoustic ceiling tiles, wall panels, and duct liners. In sound insulation, mineral wool fills the cavities of stud walls and floors, providing 5–10 dB improvement in airborne insulation by reducing resonance within the cavity. Typical densities for acoustic applications range from 40–100 kg/m³. Mineral wool is non-combustible (Euroclass A1), making it suitable for fire-rated constructions. Major manufacturers include Rockwool, Knauf Insulation, and Owens Corning.