This is due to the far higher density of material in rock wool insulation, when compared with glass wool especially. One ...

A proposed manufacturing plant southeast of the Tri-Cities will make building insulation by crushing stone, melting it and spinning the lava-like material in an industrial-strength cotton candy maker.

https://www.thehindubusinessline.com/companies/rockwool-showcases-insulation-solutions-for-power-plants/article64106646.ece Copy Rockwool India Group, a subsidiary of ...