The Basalt is heated to an extremely high temperature so that it melts, and the liquid rock is then spun into fibers. Depending on the density we want per product, a number of layers are placed on each other and then pressed together. This also explains the ribbed top. After this it is cut into the different product shapes and packaged.
* Source: T.W. Dahl: The human impact on natural rock reserves using basalt, anorthosite, and carbonates as raw materials in insulation products published in International Geology Review 53(8):894-904 2011.
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