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  • Stone wool production at the Rockwool factory is a highly sophisticated process
  • The Rockwool process resembles the natural action of the volcano
  • Environmental equipment makes the ‘tamed’ volcano an environmentally responsible process

The Rockwool process resembles the natural action of the volcanoStone wool is made by melting diabase rock and recycled briquettes, made with carefully selected by-products from our own and other industries, in a cupola furnace.  The melt is directed from the base of the furnace onto spinning wheels to form the Rockwool fibre structure.  Small amounts of binder and oil (typically 3% of total product content) are added to provide a stable, water repellent insulation product.  The stone wool is then heated to cure the binder before final processing into a variety of products.  Environmental equipment – filters, pre-heaters, after-burners and other cleaning collection systems – makes the ‘tamed volcano’ an environmentally responsible approach 

A natural source

At the turn of the twentieth century, scientists on the Hawaiian volcano Kilauea discovered a mysterious, wool-like substance in the trees. Analysis proved it to be a natural rock fibre with extraordinary properties - highly insulating and resistant to extremes of temperature.

Rockwool sustainability brochure

Download the Rockwool sustainability brochure

Why choose Rockwool?

Rockwool is shown by independent assessments to be amongst the most sustainable insulation products available anywhere, leading to an unrivalled combination of environmental savings, energy reduction, sound insulation and fire safety.

View sustainability checklist

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