One of the most popular materials is mineral wool. There are two types of wool depending on the ingredients – glass and stone. Rock wool is made from volcanic matter by heating them, then forming them into fibres, and finally adding various binders and allowing them to harden. Glass-wool is similarly produced from quartz sand and recycled glass. Mineral wool is most often chosen for thermal insulation due to its low thermal conductivity. Stone wool is used for the thermal insulation of walls, partitions, attics, roofs, and floors, while glass wool is more often used for the technical insulation of pipelines.