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Glass-Reinforced Plastic (GRP)

Glass-Reinforced Plastic (GRP / also known as fiberglass) is a fiber reinforced polymer made of a plastic matrix reinforced by fine fibers of glass.  First developed in the 1930's, GRP is lightweight, extremely strong, and robust. Strength properties are somewhat lower than carbon fiber and it is less stiff, GRP is typically far less brittle, and  much less expensive to produce. FRP is commonly used for boats, automobiles, baths, hot tubs, water tanks, roofing, pipes, cladding, casts and external door skins.