As a result of the increased demands for energy efficiency in buildings and installations, insulation will play an increasingly important role. Thick layers of combustible insulation can significantly increase the fire load of a building, and the choice of insulation material will therefore have a major impact on the building's overall fire safety.

PAROC stone wool is non-combustible

  • PAROC stone wool products are made of natural stone (96-98 %) and only a small amount of organic binder agent (~2-4 %) is added in the manufacturing process. The primary products are usually a good indicator of the fire properties of a material. Stone wool does not burn because it is made of inorganic materials. 

  • PAROC stone wool has a unique combination of excellent thermal, sound insulation and fire properties. Stone wool is used in applications where extremely high requirements are put on the insulation from several perspectives, such as shipbuilding and nuclear power plants.

PAROC stone wool meets the highest European fire class Euroclass A1

Flashover is the spontaneous ignition of hot smoke or gas which may lead to uncontrollable fire spread. In the event of flashover, mortality can rise by up to 300 %, and a small fire can develop into a major disaster. 

The reaction of material to fire is defined using the European classification system in Euroclasses A1 to F. The classification is based on the properties of the material under the influence of fire and include power dissipation, smoke production and burning droplets. Using the classification system, a material's contribution to the spread of fire and smoke can be established, including if the material has a tendency to contribute to a flashover. Non-combustible materials and products (A1 and A2) cannot cause flashover. PAROC stone wool products without a surface layer are classified as Euroclass A1, and products with a surface layer of aluminium foil or glass fibre fabric are classified as Euroclass A1 or A2-s1, d0 (EN ISO 13501-1), which means that they do not contribute to fire. PAROC sandwich panels are classified as Euroclass A2-s1, d0.

Before and after fire

Picture: Stone wool before and after a fire at a temperature of 750 °C (EN ISO 1182)


For soundproofing and applications, for example, where products are exposed to the impacts of fire, the fire safety requirements must be met with respect to ignition, flame spread and smoke development and burning droplets. PAROC's products meet the most stringent requirements for surface layers, which means that they can be used for use in all parts of a building, including corridors and technical areas.


PAROC stone wool retains its properties even at 1,000⁰C

Fire resistance indicates how the material prevents a fully developed fire from spreading from one room to another.

PAROC stone wool has an exceptionally high melting temperature at about 1,000 ⁰C, which means that it protects structures over a long time. The high melting point makes PAROC stone wool an ideal material for use in applications where requirements are set for fire resistance. For example:

  • A loaded steel structure loses strength at a temperature of around 450-550 °C depending on the quality of the steel. Using PAROC fire protection the steel can withstand a fire for up to four hours. 

  • A fire-partitioning wall made of PAROC panels can save lives, property and spare the environment in the event of a fire. Structural elements with PAROC panels meet the requirements for fire resistance for up to four hours in walls and up to an hour in ceilings. 

  • Interior walls must prevent the spread of fire from one fire protected unit to another. The fire properties of interior walls can be significantly enhanced by using PAROC stone wool in the structure.

  • In order to prevent the spread of fire through fire partitioning walls, penetrations in installations (such as ducts and pipelines) must be designed to ensure that the fire resistance of the separating structure is not impaired. The insulation must prevent heat transfer from the hot side to the cold side. If the installation and penetrations are insulated with PAROC stone wool, you will have maintenance-free fire protection during the building's lifetime.