Rockwool Solutions Rockwool is an important material for many industrial insulation applications. Rockwool Slabs can be suitable for larger flat or regular surfaces where thermal insulation and fire-performance characteristics are required. Rockwool LRB Mattresses provide a flexible format that can be adapted to larger equipment, vessels and irregular surfaces. Rockwool Pipe Sections provide a pre-formed solution for suitable pipework. The appropriate density and thickness should be selected according to the application, operating temperature and mechanical requirements.