How is stone wool made?

Stone wool, is made by melting natural rocks like basalt and dolomite (volcanic rocks) in a furnace. The new facility at Holwell will be powered by renewable electricity. The molten material is then spun into thin fibres.  Recycled materials and binders are added and the molten material is then laid on a belt to shape the material before it is cured in an oven forming slabs of Stone wool material. Once cured the slabs are cut, packaged and ready for distribution to the customer.

Stone wool is made of up to 50% recycled content and has a positive energy and CO2 balance after 3 months.