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Glass that has been spun into fine filaments and is used for insulation is known as the fiberglass. It is a common type of fiber-reinforced plastic using glass fiber. These fibers nay be randomly arranged, flattened into a sheet or woven into a fabric. They are strong  and lightweight reinforcement used in composites and is the best all-purpose choice among reinforcements for creating composite parts with excellent strength, low weight, and dimensional stability.

glass that has been spun into fine filaments can be used for insulation.