A layer of mineral wool having a first and a second main side (2, 3) which are opposite each other and define a thickness between each other, the layer of mineral wool further having a circumferential side which extends between the first and the second main side, at least a part of the first main side being provided with a sprayed-on protective layer (4) which is non-intumescent and relatively thin in comparison to the layer of mineral wool, the protective layer being adherent to the mineral wool, wherein the protective layer (4) exhibits at atmospheric pressure, during an increase in ambient temperature, a drop in its thermal conductivity.
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