Unsaturated Polyester Resin (UPR): High-Performance Polymer
Unsaturated Polyester Resin (UPR) is a thermosetting polymer produced by polycondensation between dibasic acids (e.g., maleic, fumaric, phthalic, isophthalic, terephthalic acids) and diols (e.g., ethylene glycol). The resin is typically dissolved in a reactive diluent, most commonly styrene, resulting in a yellowish, viscous liquid.
