Tunex NF is obtained by recycling NBR rubber waste. It is an environmentally friendly and non-flammable mattress used under the floor covering for impact sound insulation. Depending on the targeted acoustic performance, it can be used in different thicknesses and surface forms with flat, 8/4mm, 17/8mm dimpled options between 5mm - 25mm thicknesses. With Tunex, the impact sound level (ΔLw) can be reduced between 21 dB and 29 dB and the airborne sound insulation level (ΔRw) can be improved between 2 dB and 10 dB.