What is stone wool?
Stone wool is a wholly natural material spun into wool from rock. Rockwool stone wool is a natural material formed from one of the earth's most abundant materials - volcanic diabase rock over 200 million years old. Rockwool uses diabase rock sourced from Ireland, this reduces the transport compared to sourcing from further afield and lowers the overall carbon footprint of the Rockwool product.
The rocks are graded and crushed to a suitable size, mixed with coke and slags, then melted in a furnace at a temperature of 1500 °C.
The melt is directed onto a series of rotating wheels where it is spun into wool. From the spinning machine the wool enters a chamber where small quantities of resin binder and mineral oil are added to lock the strands together and make them water repellent.
The wool is formed into a mat which is then carried through ovens where it is cured and compressed. Then it's cut into various shapes and sizes which can be combined with other facing materials creating standard and specialist products for a wide range of applications.
Rockwool is sometimes referred to as stone wool and is part of the larger group of mineral wools which includes glass wool.