Stone wool: the high strength alternative
ISOVER stonewool products are made from volcanic rock - a natural material present in large quantities throughout the earth. The raw materials are 97% natural, and include basalt, diabase and similar igneous rocks, which are melted in a cupola furnace with fuelling and fluxing agents. Up to 30% recycled stone wool waste is added to the mix.ISOVER stonewool products combine mechanical resistance with good insulation performance, high temperature suitability and cost-efficiency, and come in a range of thicknesses specially tailored for individual applications.
The strong solution - designed for your needs.
Manufacturing Process
1. Composition
The stonewool consists mainly of basalt, slag and briquet (recycled stonewool). These raw materials are stored in silos and are automatically weighed and mixed with coke to form a fill that is placed in the cupola.
2. Fusion
The fusion of this mixture is obtained by coke combustion in a cupola heated to a temperature of over 1,500 °C.
3. REX fire drawing / Binder
The fibre drawing is performed by projecting glass on rotors turning at high speed. A binder is automatically atomized on the fibres that are transported by a strong air jet to the receipt station. The fibre core is placed in an underpressure chamber to form a homogenous primary sheet with low base weight. This blanket is transported to the batting installation.
4. Batting creeping
An arm stacks the stonewool zigzagging perpendicularly on a mat underneath. Batting allows an increase of the number of layers for a wide range of basis weights. Using a roller system, the wool blanket, consisting of several layers, can be directed and compressed. Crimping allows the fibres to straighten out in order to improve mechanical characteristics.
5. Polymerisation
The products impregnated with binder are transported to an oven heated at over 200°C. The hot air that passes through the stonewool blanket polymerises the resin, which gives the blanket its final thickness and consistency. During the curing operation, the stonewool blanket becomes ochre.
6. Packaging / Palletization
Once out of the oven, saws cut the blanket at the required width. The generated edge waste is recycled during the manufacturing process.
The stonewool blanket is then directed towards the surfacing where the products can be covered with a paper or aluminium covering, a glass or asphalt mat.
The packages are the gathered in pallets facilitating the logistics of handling, storage and loading in the transport units. The final product is available in rolls are panels.