Pigments and extenders - Methods of assessment of dispersion characteristics - Part 1: Assessment from the change in tinting strength of coloured pigments (ISO 8781-1:1990)
颜料和增量剂 - 分散特性评估方法 - 第1部分:着色颜料着色强度变化评估(ISO 8781-1:1990)
Relates to coloured pigments which have been dispersed by one of the methods described in ISO 8780. The method is of general use for comparing similar pigments, for example a test pigment against an agreed reference pigment. The principle consists in dispersing the pigment in stages under specified conditions in an agreed binder system. After each dispersion stage, a portion of the mill base is taken and mixed separately with a white pigment to form a reduced paste. The tinting strength of each reduced paste is determined as described in ISO 787-24. The percentage increase in tinting strength between two dispersion stages is calculated in order to assess the ease of dispersibility of the pigment.