ROCKWOOL stone wool is manufactured out of stone and slag without the aid of blowing agents. This process results in stone wool being highly fire resistant and capable of preventing smoke and fire from spreading in a fire. With a melting point of 2150 °F (1177 °C), stone wool is also classified as a non-combustible material that is acceptable in several UL/ULC tested and approved fire-rated assemblies. ROCKWOOL stone wool is an excellent solution for fire-stopping when used in conjunction with fire sealants to separate living units and floors. When used in place of other insulation materials, ROCKWOOL stone wool can provide critical additional time for occupants to safely evacuate the building.