ISO 787 discusses pigments and extenders. ISO 78714 is the fourteenth part of the ISO 787 multi-series and discusses the determination of resistivity of aqueous extract. ISO 787-14 specifies a general method of test for determining the electric resistivity (specific electric resistance) or the specific electric conductivity, respectively, of the aqueous extract of a pigment.
The method is applicable to all pigments and extenders, except pigments that are soluble in water. The resistivity of the aqueous extract of a pigment is considered as a property independent of the amount of water-soluble matter. If agreed, a cold extraction method can be used.
ISO 78714 on pigments and extenders is useful for
An extender pigment is a naturally occurring chemical substance (usually having a white color) that is added to paint or coating to improve its properties such as durability, cost, and resistance to corrosion or wear.
ISO 787-14 provides you with the test to determine the electric resistivity (specific electric resistance) or the specific electric conductivity, respectively, of the aqueous extract of a pigment.
ISO 787-14 also guides you with sampling, test procedures, and test reports. ISO 78714 helps you to improve the quality of your paints and their properties such as durability, cost, and resistance to corrosion or wear.
BS EN ISO 78714:2019 supersedes BS EN ISO 78714:2002, which is withdrawn. BS EN ISO 7879:2019 includes some technical changes with respect to BS EN ISO 78714:1995. These include:
ISO 787-14
EN ISO 787-14