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8) How is stone wool manufactured?
Grodan stone wool is manufactured from basalt and limestone. These raw materials are heated in an oven at 1500°C, when they melt into lava. The lava is then poured onto a number of discs spinning at a high speed. The centrifugal force throws drops of lava from the discs, which are then transformed into threads. In fact, the process is similar to that used to make candy floss at the fairground. The threads are compressed to form a solid mass, which is then sawn into slabs and blocks.  Back to FAQ's
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