BS EN ISO 15091:2020 pdf download – Paints and varnishes — Determination of electrical conductivity and resistance This document 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 The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling 3? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 3.1 electrical resistance R ratio of the potential difference along a conductor and the current through the conductor Note 1 to entry: Resistance is given by Ohm’s law shown in Formula (1): 3.5 cell constant c quotient of the length and the cross-sectional area of a conductor Note 1 to entry: It is given by Formula (5): From Formula (2), it can be seen that it corresponds to the ratio of the resistance to the resistivity of the conductor material. For the determination of the resistivity by resistance measurement, this geometrical factor, i.e. the cell constant of the measurement assembly, will need to be known. Cell constants are given in reciprocal centimetres (cm –1 ). 4 General 4.1 Measurement of the resistance The resistance may be determined by; a) the...
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