ISO 787 discusses general methods of test for pigments and extenders. ISO 787-22 is the twenty-second part of the ISO 787 multi-series and discusses the comparison of resistance to bleeding of pigments.
ISO 787-22 specifies a general method for comparing the resistance to bleeding of a pigment with that of an agreed sample.
Note: When this general method in ISO 787-22 is applicable to a given pigment, only a cross-reference to it should be included in the International Standard relating to that pigment with a note of any detailed modification which may be needed in view of the special properties of the pigment in question. Only when this general method is not applicable to a particular pigment should a special method for comparison of resistance to bleeding be specified.
ISO 787-22 on general methods of test for pigments and extenders is useful for:
Pigments, dyes, and extenders are incorporated in binders to obtain decorative effects (e.g., color, gloss, dulling) or functional effects (e.g., corrosion protection) on a surface coating. Hence it is important to have pigment with a good resistance quality.
Although several methods for determining resistance to bleeding are available, for example, solubility in a solvent, the method in ISO 787-22 has been established because it is essentially a practical test and as such is probably of greater general value than other methods. ISO 787-22 helps you determine the resistance of pigments and that helps you in improving the quality of your coatings.
EN ISO 787-22:2017
ISO 787-22:1980