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Stone wool

Why stone wool?

  • Stone wool is made entirely from natural stone, a raw material with many benefits. It is inertly sustainable and a virtually inexhaustible natural resource. Because of its composition, the end products made from natural stone are also both sustainable and durable.
  • Sustainable: Made of natural stone.
  • Consists of about 98 % air and 2 % stone fibres.
  • Has a unique combination of naturally created benefits.
  • Resistant to both fire and water.
  • Maintains its isolating functions and dimensions during the whole lifecycle of a building despite changes in temperature and humidity.

Fire Safe

  • Non-combustible.
  • Classified as Euroclass A1 – the highest European fire class for building materials.
  • Maintains its fire protective properties up to 1 000 ºC.
  • Can protect structures from collapsing from a fire for up to 4 hours.
  • Prevents spreading of fire.
  • Protects combustible materials for up to 60 minutes.
  • Maintenance free – strong protection for the whole lifetime of the building.
  • Provides time for people to evacuate a building.
  • Can be used under extreme conditions such as in industries or plants.
  • Emits very little smoke during a fire.

Stone wool provides the most versatile moisture protection

  • Does not absorb moisture from the surrounding air. Stays dry even in humid environments.
  • Does not absorb liquid water.
  • Dries quickly in normal room temperature.
  • Maintains its thermal performance and dimensions after moisture exposure.
  • Acts as a capillary break in underground solutions.
  • Does not block moisture to the constructions – is a diffusion open material (Mμ = 1) that allows water vapor transportation through it.

Keep constructions dry

  • Allows significantly faster drying of concrete structures than impermeable insulation materials.
  • Does not collect moisture in constructions and therefore reveals possible moisture leakages fast.
  • Does not allow condensation to happen inside the insulation layer.

Prevents moisture risks

  • The chemical balance is unfavourable for corrosion.
  • Contains no fire retardants that promote corrosion.
  • Is tested resistant towards mould growth (95-100% relative humidity and 22ºC for 28 days).
  • Performs well even in 2030 climate conditions at relative humidity levels of RH80% and RH95%


Even if our stone wool is made of natural stone, a raw material that is natural and essentially inexhaustible, we need to make optimal use of our planet’s resources. We do this in several different ways, both in our own manufacturing process and in providing services that support recycling of our products. Our stone wool can be recycled again and again into new stone wool.

  • Stone wool is suitable for re-use as thermal insulation at a new site, provided that the material can be extracted intact from its previous location.
  • Waste material generated by cutting boards in production is used as raw material for new stone wool products, reducing the need for virgin material.
  • Insulation is used as transportation pallets to minimize waste (roof products).
  • Waste insulation is reused as blowing wool.
  • Stone wool can be used safely as landfill or soil structure.

Fibre is safe

  • The European Certification Board for Mineral Wool products (EUCEB) trademark on our products confirms that our stone wool fibre fulfils the bio solubility requirements of EU directive No. 1272/2008.
  • The German RAL quality mark confirms that the bio solubility and safety requirements are met according to the German technical regulation TRGS905.

Has low emissions

  • Our stone wool meets the most stringent requirement (M1) in the Finnish voluntary system for building material emissions.

Does not contain any dangerous substances

  • Our stone wool fibre is registered according to REACH chemical regulation. Our products do not contain substances of very high concern listed in the so called “Candidate list”. A User Instruction for safe use is available for all our products.
  • The technical dossier in REACH registration contains a chemical safety report about properties and classification. Our sone wool fibre is a mineral wool Nota Q fibre and is not evaluated as hazardous or classified as an irritant.

Our products contain no hazardous substances in the RoHS directive

  • This means our products can also be used in electrical and electronic equipment.

Is safe to handle

  • We recommend the use of loosely fitting work clothes and gloves during the installation of mineral wool. Dust release should be controlled as much as possible.
  • We have signed a voluntary agreement to demonstrate product handling on product packages with text and a pictogram that has been agreed between all members of the European Mineral Wool Manufacturers association EURIMA (European Mineral Wool Manufacturers Association).

Sound reducing

  • Is available in a wide assortment of products and solutions for acoustic control.
  • Is excellent at noise reduction and sound absorption thanks to its high density, optimal fibre structure and air permeability.
  • Stone wool-based acoustic slabs are generally classified in the best class – A – for sound absorption.