BS EN ISO 15091:2020,Paints and varnishes – Determination of electrical conductivity and resistance.BS EN ISO 15091:2020 pdf free download.
BS EN ISO 15091:2020 specifies a method for determining the electrical conductivity and the electrical resistance of coating materials. The conductivity is usually measured for water-borne paints and varnishes, including electrodeposition coating materials, and the resistance is usually measured for solvent-borne paints and varnishes. If required, the resistivity of the coating material is calculated from either of these measurements. The method is applicable to products having a conductivity less than 5 µS/cm, corresponding to a resistivity greater than 200 kΩ⋅cm.
The conductivity of coating materials influences their processibility in the presence of an electric field. This is particularly important for electrodeposition paints and coating materials which are processed electrostatically.
2 Normative references
ISO 1513, Paints and varnishes – Examination and preparation of test samples;
ISO 3696, Water for analytical laboratory use – Specification and test methods;
ISO 4618, Paints and varnishes  – Terms and definitions;
ISO 5528, Paints, varnishes and raw materials for paints and varnishes-Sampiing;
4 General
4,1 Measurement of the resistance
The resistance may be determined by;
a) the measurement of the current through a sample and the voltage acting on the sample, or
b) comparison of the measured resistance with a reference resistance
For the current/voltage measurement, usually a constant pre-determined voltage is applied to the sample,and the current is measured with a suitable measuring instrument.The resistance is then calculated from Formula (1), See Figures1 to 3.