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Unsaturated polyesters are condensation polymers formed by the reaction of polyols (also known as polyhydric alcohols), organic compounds with multiple alcohol or hydroxy functional groups, with unsaturated and in some cases saturated dibasic acids.
Unsaturated polyester resins are mainly used in the production of fiber reinforced plastics and filled plastic products, including sanitary-ware, tanks, pipes, gratings, and high-performance components for the marine and transportation industry such as closure and body panels, fenders, boat hulls/ decks and other large.
Polyester resin offers many advantages, such as low cost, adequate resistance to water and many chemicals, resistance to weathering and aging, reasonable temperature resistance (up to 80°C), good wetting to glass fibers, low shrinkage (4%–8%) during curing, and linear thermal expansion (100–200·10−6 K−1).
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