POLYESTER RESIN LAMINATE SHEET UPGM205 UPGM (unsaturated polyester glass mat) is rigid insulation material made by alkali-free glass mat impregnated in unsaturated polyester resin and additives, cured by heat and pressure. Materials exhibits excellent electrical and mechanical properties, widely used in railway industry, photovoltaic industry, wind power, power transmission and distribution, metallurgy, mining, petrochemical industry, public transportation, etc.