Topic summary
stone wool
Extracted from the Wikipedia article Mineral wool.
Manufacture
Stone wool is a furnace product of molten rock at a temperature of about 1600°C through which a stream of air or steam is blown. More advanced production techniques are based on spinning molten rock in high-speed spinning heads somewhat like the process used to produce cotton candy. The final product is a mass of fine, intertwined fibers with a typical diameter of 2 to 6 micrometers. Mineral wool may contain a binder, often a terpolymer, and an oil to reduce dusting.