Stone wool

What is stone wool?

Also known as mineral wool or rock wool, stone wool is created by spinning a molten stream of rock, steel furnace slag and recycled materials. Made principally from volcanic rock, it is comprised of 70% natural raw materials including basalt, dolomite and similar rocks, which are generally melted in a cupola furnace with a carbon-containing energy source using optimal energy and environmental protection recovery systems.

How do we make stone wool?

1. Composition: The basalt, slag and briquet (recycled stone wool) are stored in silos. These raw materials are then automatically weighed and mixed with coke.

2. Fusion: This mixture is fused through coke combustion in a cupola heated to over 1,500 °C.

3. Fibre drawing / Binder: The fibre is drawn by projecting glass on high-speed rotors. A binder is automatically atomized on the fibres and the fibre core is placed in a pressurized chamber to form a homogenous primary sheet. This blanket is then transported to the batting installation.

4. Batting creeping: The arm stacks the stone wool zigzagging perpendicularly on a mat underneath. Batting increases the number of layers to achieve a wider range of basis weights. Using a roller system, the multi-layer wool blanket can be directed and compressed. Crimping straightens the fibres to improve their mechanical characteristics.

5. Polymerisation: The binder-impregnated products are transported to an oven heated to over 200°C. The hot air that passes through the stone wool blanket polymerises the resin, which gives the blanket its final thickness and consistency. 

6. Packaging / Palletization: Once out of the oven, the blanket is cut to the required width. Any edge waste is recycled during the manufacturing process. The stone wool blanket can be covered with a paper or aluminium covering, or a glass or asphalt mat.

Stone wool, also referred to as rock wool, is created by spinning molten rock and minerals with steel slag to create a cotton-candy-like wool product.

Why choose stone wool?
Stone wool can be used for insulation and fire protection in many applications. It is particularly suitable for industry given its high temperature resistance and non-combustibility.

Some of our most popular products:

Stone Wool Wired Matt : High performance wired matts for technical insulation

Stonewool Slab : High performance insulation slabs for technical and industrial applications.