The thermal conductivity of mineral wool products varies with temperature, fibre structure, distribution and orientation of the fibres, the percentage of non-fibrous particles and the bulk density. A low thermal conductivity is desirable to achieve a high resistance to heat transfer.

Our noise test clearly demonstrates the excellent acoustic properties or Roxul stone wool. The result of this is lowered sound level in adjacent rooms and improved indoor climate.

Buildings should be constructed in such a manner that if a fire starts, the extent of the fire and smoke damage would be minimized and kept as close to the source of fire outbreak as possible. Not only is Roxul stone wool non-combustible – it also resists temperatures above 1,000 ^oC without melting.

This demonstration clearly shows that stone wool absorbs very little water when fully immersed. As comparison material we use glass wool, which absorbs water more than 200 times its weight.
 
The water repellence of our stone wool has been tested in accordance with BS 2972 (total immersion)  > 96 (Vol. %). In accordance with the German industrial standard AGI Q 136, the water repellence is > 99 (Vol. %).

The vapour resistance of Roxul stone wool products is negligible and usually considered similar to air. Roxul products therefore reduce the risk of condensation and allow natural drying of the construction due to their ability to ‘breathe’.