Basalt rock, stone wool insulation, briquettes formed of recycled stone wool material.

Stone wool is a natural material formed when molten lava from volcanic eruptions is thrown into the air and re-solidifies as fibres. Rockwool recreates this process by melting volcanic diabase rock and recycling ‘briquettes’ together with other raw materials at 1500°C in a furnace. The wool product has outstanding thermal, acoustic and fire insulation properties, as well as being highly durable and recycle-able. Not only can Rockwool off-cuts and other Rockwool production by-products be recycled directly back into stone wool but selected by-products from other industries are also reused.

Credit: ROCKWOOL