Rockwool, also known as mineral wool, is an insulation material made from natural stone or mineral fibers. The density of Rockwool refers to the mass of the material per unit volume, and it is commonly expressed in kilograms per cubic meter (kg/m�³) or pounds per cubic foot (lb/ft�³).

The density of Rockwool can vary depending on the specific product and its intended application. Common densities for Rockwool insulation products range from approximately 40 kg/m�³ (2.5 lb/ft�³) to 200 kg/m�³ (12.5 lb/ft�³) or more. The choice of density often depends on factors such as thermal performance requirements, structural support needs, and the specific application of the insulation.