Polyester resin
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Polyester Resin - Unsaturated Polyester Resin. The term generally used for unsaturated (means containing chemical double bonds) resins formed by the reaction of dibasic organic acids and polyhydric alcohols, basiccomponent of SMC/BMC.
Polyester resin is also known as a thermosetting plastic, which implies the plastic sets at high temperatures as apposed to thermoplastics which can be formed at high temperatures.
Reichhold, Inc. is the world's largest supplier of unsaturated polyester resins for composites. Reichhold Website