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Fiberglass is a composite material that relies upon and small glass fiber for its strength. The fibers may be randomly arranged, flattened into a sheet, or woven into glass cloth. The plastic material may be a thermoset polymer matrix, which is most often based on thermosetting polymers such as epoxy, polyester resin, or vinyl resin. Fiberglass is an immensely versatile material because it is lightweight, due to its inherent strength, weather-resistant finish, and a variety of surface textures. The process of manufacturing fiberglass is called pultrusion.