Worker laying fiberglass insulation.

Fiberglass

Fiberglass, as most consumers understand it, is a glass composite. It’s made when glass filaments are woven or pressed together, and can be strengthened and/or molded in different ways with the addition of plastic resins. Technically, the word Fiberglass is a trademarked name—owned by Owens Corning—now a proprietary eponym, a brand name that, due to its popularity or significance, has become the generic name for the product it represents.

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