Class O acoustic foam is a flexible open cell material offering durability and excellent sound absorbing qualities. The material is chemically inert, non-dusting and due to its flexibility is easily applied to curved surfaces or deformed to fit complex shapes. The product has the additional benefit of being exceptionally fire resistive, meeting the requirements of Class ‘O’ to Building Regulations. Class O Foam also meets euro class B-S1, D0 EN13501-1 6MM to 50MM tested with 1mm steel. Tap Acoustic Class O Acoustic Foam Specifications Colour: Dark GreyThickness: 50mmDensity: >90kg/M3 BS EN ISO 845Sound Absorption: NRC > 0.75