2020UNE-EN ISO 787-9:2020 General methods of test for pigments and extenders - Part 9: Determination of pH value of an aqueous suspension (ISO 787-9:2019)
1996UNE-EN ISO 787-9:1996 GENERAL METHODS OF TEST FOR PIGMENTS AND EXTENDERS. PART 9: DETERMINATION OF PH VALUE OF AQUEOUS SUSPENSION. (ISO 787-1:1981).