Noise reduction slab PAROC NRS 2t is non-combustible stone wool insulation for use as a sound absorbing infill for the reduction of airborne noise in partition walls, between flooring joists and suspended ceilings. It is also used as a sound absorption wall and ceiling covering in technical spaces where there are low requirements for the visual look. Stone wool insulations have varying degrees of air flow resistivity that are largely dependant on the density of the material. Generally speaking, the higher the density, the higher the airflow resistivity, the greater the potential for sound absorption, particularly at lower frequencies. PAROC NRS 2t has a density of ~65 kg/m3. The noise reduction slab is soft and resilient. It is easy to handle and install for different kinds of applications. The noise reduction slab is faced with natural coloured glass fibre tissue.