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Product Information

Glass Wool

Glass Wool

Detailed Description

Glass wool is from the family of mineral wool, a good insulating material made from fibers of glass arranged using a binder into a texture similar to wool. Fiberglass is the most common insulation used in modern times. Because of how it is made, by effectively weaving fine strands of glass into an insulation material, fiberglass is able to minimize heat transfer

The process traps many small pockets of air between the glass, and these small air pockets result in high thermal insulation properties. Fiberglass is an excellent non-flammable insulation material, with R-values ranging from R-2.9 to R-3.8 per inch.

Glass wool is available in Roll OR in Slabs form, with different thermal and mechanical properties. It may also be available as a material that can be sprayed or applied in place, on the surface to be insulated.

Gases possess poor thermal conduction properties compared to liquids and solids, and thus make a good insulation material if they can be trapped. In order to further augment the effectiveness of a gas (such as air) it may be disrupted into small cells which cannot effectively transfer heat by natural convection. Convection involves a larger bulk flow of gas driven by buoyancy and temperature differences, and it does not work well in small cells where there is little density difference to drive it.

In order to accomplish formation of small gas cells in man-made thermal insulation, glass and polymer materials can be used to trap air in a foam-like structure.

After the mixture of natural sand and recycled glass at 1,450 °C, the glass that is produced is converted into fibers. It is typically produced in a method similar to making cotton candy, forced through a fine mesh by centripetal force, cooling on contact with the air. The cohesion and mechanical strength of the product is obtained by the presence of a binder that “Bonds” the fibers together. Ideally, a drop of binder is placed at each fiber intersection. This fiber mat is then heated to around 200 °C to polymerize the resin and is calendared to give it strength and stability. The final stage involves cutting the wool and packing it in rolls or panels under very high pressure before palletizing the finished product in order to facilitate transport and storage.


Glass wool is a thermal insulation that consists of intertwined and flexible glass fibers, which causes it to "package" air, resulting in a low density that can be varied through compression and binder content (as noted above, these air cells are the actual insulator). Glass wool can be a loose fill material, blown into attics, or, together with an active binder sprayed on the underside of structures, sheets and panels used to insulate flat surfaces such as cavity wall insulation, ceiling tiles, curtain walls as well as ducting. It is used to insulate piping, equipment and also used as an acoustic/ soundproofing material.

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