Performance of the test
A small cube is cut out of the sample piece. Any existing internal and external membranes are removed. This leaves a resin sample weighing approximately 10 to 20 mg. This sample is filled into a crucible of the DSC instrument and heated. Here it must be taken into account that chemical cross-linking of thermosetting materials does not allow them to melt or flow if they are reheated after curing. However, cross-linked materials suffer a slight softening at an elevated temperature, which is called the glass transition temperature (Tg). Within one hour, the samples are heated twice evenly and the glass transition temperature Tg1 and Tg2 is determined. The results can be compared, for example, with the nominal values of the DIBt approval. The closer the values of Tg1 and Tg2 are to each other, the better the resin is cured.
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