The Origins and Properties of Stone Wool

28 December 2017

Stone wool (or mineral wool) was discovered on the islands of Hawaii around the beginning of the ninteenth century. It occurs there naturally as a byproduct of volcanic activity.

In its manufactured state, stone wool combines the power of rock with the characteristics of typical insulation wool. And, thanks to its non-directional fiber orientation, it also exhibits some unique and valuable characteristics.

Sound Absorbent

  • Unique non-directional structure of ROCKWOOL stone wool insulation is denser than traditional insulation products
  • Non-directional fibers help to absorb acoustic waves and can reduce the intensity and propagation of noise
  • Effectively reduces airflow and sound transmission
  • Higher air flow resistivity means better sound attenuation

Fire Resistant

  • ROCKWOOL stone wool can withstand temperatures up to 2150º F (1177º C); consequently, it does not contribute to the development and spread of fire or the release of toxic gases

Water Repellent

  • ROCKWOOL stone wool is water repellent yet vapor permeable
  • The long-term R-value of stone wool is unaffected by moisture over time, due to the inherent drying potential of the product
  • Completely resistant to rot, mildew, mould and bacterial growth—contributing to a safer indoor environment

Dimensional stability

  • Retains its characteristics over time
  • Minimal changes in size and performance are evident with changes in temperature and humidity

Discover more about stone wool's unique qualities.