When choosing rock wool insulation material, I would first look at the working area rather than only the price. The supplied product file says rock wool board is made mainly from basalt after high-temperature melting and fiber processing. It is used for building insulation, sound absorption, and fire protection. For exterior walls, equipment rooms, and partition systems, the material is useful because it keeps its shape under heat and does not behave like ordinary foam insulation.
The figures in the notes are helpful for a buyer doing a real comparison. Rock wool board can reach A1 fire rating, and its melting point is listed above 1000 C. The same file mentions water repellency up to 99.9 percent, with low water absorption and no capillary penetration. These details matter when the insulation will sit near humid walls, steel structures, or pipe areas. In practice, I would match the board thickness and density to the wall design, required fire rating, and local installation habit before placing an order.