Black Rock Wool Density: 60kg/m3, 120kg/m3, 145kg/m3, 160kg/m3,180kg/m3 Black Rock WoolThis product can stand temperature ≥950oC ... higher level.In China, it is called black rock wool. This rock wool was added with 6% bauxite, 3% copper mine, ... 18% iron mine on the basic of general rock wool. We ever exported to Korea used in fireproof door.Density ... /m3, 145kg/m3, 160kg/m3,180kg/m3 Black Rock Wool