Coating Terms

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Formation of insoluble coating films is aimed by crosslinking binders present in the coating formulation. Determination of crosslinking ratio of coating film has influence on the performance of the film after application. In order to determine this ratio, a solvent or solvent blend is chosen to dissolve the unreacted binder left in the film. Pieces of coating film, scraped from the surface, are extracted with the chosen solvent (blend) and unreacted binder is removed from the film together with the pigments and fillers attached to it. Percentage ratio of remaining sample weight to the initial sample weight is called the gel fraction.