Glass wool insulator

Raw materials

Raw materials comprising glass wool insulation and their percentage are as follows:

44% silica, 18% sodium carbonate, 11% dolomite, 12% feldspar, 7% borax, 4% limestone, 3% barium carbonate and 1% sodium sulfate.

The purity of the raw material plays a very important role in the quality of glass wool fibers.


Glass wool fibers

Glass wool is made of very thin fibers with a high flexibility. A large number of these fibers are woven together in the manufacturing process which produces a layer of glass wool insulator with a specified width and length and different covers.

The weaving of these fibers leaves a lot of holes and spaces among them which then trap some air inside and give the glass wool an insulating feature.

From the raw material table you see that contrary to popular belief, asbestos which is a known carcinogen is not under any circumstances used in the production of the glass wool. The fact is that glass fibers and asbestos are not related at all and throughout the world, mineral insulators are known as the most used insulation.

In all international standards, glass wool insulation reaction to fire has been studied and approved of in two aspects.


No participation in fire

Glass wool (silica base) unlike other polyurethane and polystyrene insulators (carbon base) don’t take part in the fire. When aflame, carbon base insulators release toxic gases of carbon dioxide, carbon monoxide and hydrogen cyanide which are considerably more dangerous than the fire itself and can lead to rapid suffocation and death of the residents.

Fire resistance

Among the insulations used in constructions, mineral insulation has a much greater resistance against fire and not only it doesn’t help the spread of fire but also speeds down the process remarkably.


Fiberglass is used for products that need heat insulation or a rigid corrosion resistant material. Fiberglass is used to make pipes with different mechanical and hydraulic features to transfer fluids in most major projects such as oil pipelines, industrial and petrochemical process lines, municipal water and sewage transfer, and urban tunnels. Glass fibers are also used in the production of fiberglass sheets.

In Iran, glass fibers are mostly used for sheet making and manufacturing industrial parts.