Stiffness, airflow resistance and other properties linked to the acoustic performance of a mineral wool product mainly depend on the bulk density, fibre orientation, fibre diameter, binder and possible additives. Rockwool can specify all these parameters in a wide range depending on the desired properties. Even if the density, which is more or less the only “visible” property for the customer, is the same for two products, these products can have totally different properties regarding acoustics, fire and thermal conductivity.

Therefore it is recommended to ensure the right product data for the actual product before making any acoustic calculations.