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This International Standard specifies a method of measuring

• the time required for the temperature of a solution of unsaturated-polyester resin and a catalyst, heated in a thermostatically controlled bath at 130 °C, to rise
• from 80 °C to 140 °C,
• from 80 °C to the maximum temperature reached;
  • the maximum temperature reached;
  • the speed of the reaction, determined by drawing a tangent at the point of inflection of the temperature/time curve.

It applies in particular to unsaturated-polyester resins processed at a temperature higher than 100 °C.