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Glasswool is considered to be the most effective, and environmentally friendly insulation product to use as it is non-combustible, and meets the requirements for optimal thermal and acoustic insulation performance.

Saint-Gobain ISOVER manufactures a comprehensive range of Glasswool insulation products that provide thermal, acoustic and fire performance in a wide variety of applications.

Glasswool is produced from a combination of up to 80% recycled glass, naturally occurring silica sand and fluxing agents resulting in a product that has Zero Ozone Depleting Potential (ODP) and no CFC’s or HCFC’s are produced in the process.

What is Glasswool?

Glasswool is made from silica sand to which recycled glass (cullet) and fluxing agents are added. The material is melted to 1100°C in an electric furnace and then conditioned in a gasfired forehearth. The fibre is formed by centrifugation through drilled circular baskets, where after, binding products and elements specific to the usage are added. No CFC`s or HCFC`s are produced in the production process. The fibres are gathered in a mat form in a collection chamber and then conveyed to an oven where it is cured under controlled conditions to the required thickness and density. 


Glasswool production


Once complete the product is then packaged in roll or batt form, and our patented process means that thanks to Glasswool`s elastic properties, it can be compressed by a factor of up to 10 which saves on storage and reduces transport costs.

How its made

Production Process

1. Batch
2. Melting
3. Fiberising
4. Forming
5. Cutting
6. Packaging
7. Storage

Glasswool production

Isover South Africa invested R 30 million upgrading our production facilities, installing the latest TEL fiberising technology which has improved the quality and performance of our fibres and has increased our production capacity by 30%. 

Energy efficiency improvements have been one of Isover`s main focuses for many years and energy consumption has dropped by 20% per ton of product with an equivalent reduction in CO2 emissions.
We have lowered our water consumption per ton of Glasswool produced by 30% by the use of closed circuit systems and investing in new equipment that consumes less water. 

Why choose Glasswool

  • Glasswool products are non-combustible and positioned for operating temperatures up to 300°C.
  • It is made of 80% recyclable materials
  • Is poses no health hazards
  • It is lightweight and easy to install
  • Glasswool will not promote mould growth or vermin infestation
  • It is non corrosive to metal

Applications of Glasswool insulation

Glasswool insulation products are manufactured to be applied in multiple areas of buildings. Glasswool is most commonly known for insulation in ceilings of residential buildings, but we also offer products for the following applications: