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Paint and Coatings Industry Standards
ISO 787-4:1981 ISO 787-4:1981 General methods of test for pigments and extenders -- Part 4: Determination of acidity or alkalinity of the aqueous extract
The principle of the method consists in the hot extraction of the material by following the procedure specified in ISO 787/3, to the stage of obtaining a perfectly clear filtrate. The determination is carried out with indicator solution (method A).
