Patent ID: 6842016

Claim:
A method of evaluating the time left before gelation of a sample of a thermosetting composition during the polymerization reaction, wherein the following stages are carried out: a) drawing, by means of dielectric measurements performed on the composition, a first chart representing the critical frequency associated with a predetermined phase shift value φ as a function of the temperature of the composition and as a function of the progress of the polymerization reaction of the composition, b) drawing a second chart representing the time left before gelation of the composition as a function of the temperature of the composition and as a function of the progress of the polymerization reaction of the composition, c) at a time t1, determining the critical frequency associated with said phase shift value φ by means of dielectric measurements performed on a sample of the composition under polymerization and measuring the temperature T of the sample, d) by means of the first chart, of the critical frequency determined in stage c) and of temperature T measured in stage c), determining the progress of the polymerization reaction of the composition of the sample at the time t1, e) by means of the second chart and of the progress determined in stage d), determining the time left before gelation of the composition of the sample after the time t1 as a function of the temperature to which the sample will be subjected after the time t1.