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(KODEST)Gel fraction (GEL fraction)

dgkede
2025-09-01
It is a quantitative indicator of the degree of paint film curing. There are multiple testing methods available.

1) Solvent immersion method: Soak the dried paint film in a specified mixed solvent for a certain period of time, and express the percentage of the weight loss of the paint film to the original paint film weight.

2) Reflux method: After the coating is baked and cured, low molecular weight substances that have not reacted or fully participated in the reaction remain in the coating. The degree of coating curing is estimated by solvent extraction of molecules that do not participate in the three-dimensional cross-linking reaction.

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