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A bundle of optical fibers.

Fiberglass (also called fibreglass and glass fibre) is material made from extremely fine fibers of glass.

It is used as a reinforcing material for many polymer products. The composite material, that is produced by this method is called "fiberglass" in popular usage. The proper names are fiber-reinforced polymer (FRP) or glass-reinforced plastic (GRP).

Glassmakers throughout history have experimented with glass fibers, but mass manufacture of fiberglass was only made possible when finer tools for machines were produced.


Glass fiber is formed when thin of silica-based or other formulation glass is extruded into many fibers with small diameters that are suitable for textile processing. Glass is unlike other polymers because, even as a fiber, it has little crystalline structure (see amorphous solid). The properties of the structure of glass in its soft stage are very much like its properties when spun into fiber.


Bare fiberglass can cause skin irritation and cuts when handled without gloves. There have been concerns that fiberglass can be accidentally inhaled into the lungs, where it can cause cancer and other lung problems, similar to asbestos.[1] Fiberglass has been called "man-made asbestos". Substitutes for fiberglass building insulation, such as cellulose and aerogel, have started to appear.

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