This sheet 5 of IEC 60455-3 gives the requirements for unsaturated polyester based impregnating resins, and includes requirements for certain properties at elevated temperature.
IEC 60455-3-5 Ed. 3.0 b:2006
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Resin based reactive compounds used for electrical insulation – Part 3: Specifications for individual materials – Sheet 5: Unsaturated polyester based impregnating resins