The raw material of a product is usually a good indicator of its properties. Stone wool is made from volcanic stones, typically basalt or gabbro, anorthosite and dolomite as 96 – 98 % of its weight. The remaining 2 – 4 % of the stone wool is organic binder. This binder is typically a phenol-formaldehyde resin that requires curing at elevated temperatures. Stone wool is produced by melting stones in a cupola furnace at a temperature of 1500°C. Coke and electricity are used as the source of heat energy.

Stone wool production has several stages:
  • Heating the stones at a high temperature 
  • Spinning the resulting viscous melt into fine fibres
  • Adding a small amount of binding materials (oil and silane)
  • Compressing the primary mat to the required density and reheating it to cure and harden the resin binding
  • Cutting or forming the stone wool mat into the required sizes or shapes
PAROC material stones 

Stone wool production

The stone wool is sawn to the required size and shape – for example, into rolls, slabs, boards – or it is customised for addition to other products. Off-cuts and other mineral wool scraps are recycled back into the production process.

Due to its impressive elasticity, mineral wool can be compressed to reduce its volume during packaging, making it cheaper and easier to transport and handle.

Waste, such as off-cuts, is recycled into the production process reducing inputs and energy requirements.

Gases from the production processes are cleaned in filters and after-burners to minimise the impact on the environment.

Due to the natural, durable and non-combustible raw materials, stone wool has the unique ability to:

  • Save energy 
  • Minimise pollution
  • Combat noise
  • Reduce the risk of fire
  • Protect life and property in the event of fire

View video called "The Story of Mineral Wool" from Eurima (European Insulation Manufacturers Association)

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