Is stone wool fire resistant?

Stone wool is recognised as a non-combustible material in the European reaction-to-fire classification system (Euroclass A1 Reaction to Fire). This means it does not significantly contribute to the development or spread of fire. 

However, the term “fire resistant” can refer to different things. Stone wool itself performs extremely well in reaction to fire, but fire resistance ratings such as EI30 or EI60 apply to complete building elements or systems, not just a single material alone. 

As a material, stone wool can withstand very high temperatures and does not burn or promote flame spread. Its mineral structure also slows down heat transfer, which is why stone wool is commonly used in many fire-resistant constructions. The level of protection it provides depends on the material density, thickness, and how it is used within a construction. 

For example, stone wool is often combined with other materials (such as gypsum boards or structural elements) to create installations that achieve specific fire resistance classifications. In these installations, the stone wool layer helps delay heat transfer and contributes to keeping the integrity of the overall system for a certain period of time. 

To verify the declared reaction to fire classification of a specific Rockfon product or installation, always check the product datasheet or Declaration of Performance (DoP). 

Fire resistance performance depends on the full construction, and requirements and classifications can vary between countries. 

For project-specific guidance, contact us to speak with a Rockfon expert.