Stone wool and slag wool insulation are created using the same basic processes. But stone wool uses 75% basalt rock - turning them into high temperature-resistant fibres. Slag wool insulation in turn, uses blast furnace slag as the primary component. Natural rock, particularly basalt is both highly non porous and has excellent thermal insulation properties. To learn more, visit: https://fal.cn/3A9P8 | ROCKWOOL | Facebook