ASTM D2369 Volatile Content of Coatings
Solvent-borne coatings are mixtures designed to coat surfaces with desired attributes. These mixtures contain a solvent that evaporates after application to yield the proper coating. The ratio of solvent to active ingredient is important to give the right consistency during application and the right thickness to the resulting coating. This test determines the percentage of volatile organic content of coatings. It may be used to determine specification adherence or quality control.
The weighed sample is diluted with solvent so that it spreads out uniformly in an aluminum weighing pan. The weighed pan is heated as per the method to evaporate all solvents and weighed again. The percent volatile material (as well as the non-volatile residues) in the coating is calculated and reported.