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An η(t)-diagram of a time-dependent hardening material usually shows a course of the viscosity curve as displayed in Figure 3.45. Here, two time points are relevant:

1 time point tS as start time at the onset of gelation or curing reaction

2 time point tV when reaching the previously defined viscosity value

The terms gel time, gelation time, hardening time often are used as synonyms. Examples of measuring curves showing gelation of modified starch are displayed in [3.70]

Figure 3.45: Time-dependent viscosity function of a sample showing gelation or curing: The

gelation or curing reaction starts at time point tS and the previously defined viscosity value is reached at time point tV