BS EN ISO 15091:2020 pdf download.Paints and varnishes — Determination of electrical conductivity and resistance.
7.2 Viscosity of test sample The test is usually carried out at the same viscosity as that of the product under test when it is ready for use. The solvent used to adjust the viscosity, if this is necessary, shall be agreed between the interested parties.
7.3 Number of determinations Make at least three individual measurements on the product under test.
7.4 Measurement of the electrical resistance or the electrical conductivity Take the required quantity of the paint sample and immerse the electrodes in it, avoiding the formation of bubbles. If required, homogenize the material before doing this. Prior to the measurement, check the measuring cell for cleanliness and remove any particles of dirt. Connect the measuring cell to the measuring instrument. For measurements using a direct-current measuring instrument, e.g. a Wheatstone bridge, read the value after a waiting time of 10 s in order to allow the electrical potential to become constant. For measurements using an alternating-current measuring instrument, read the value after an agreed waiting time. When using continuously measuring instruments, the value shall only be read if it is constant for more than 20 s. Immediately after the test, thoroughly clean the measuring cell.
8 Expression of results Calculate the mean of the at least three individual measurements made of the resistance or conductivity. If required, calculate the resistivity from this mean value, using Formula (2) if resistance measurements were made or Formula (4) if conductivity measurements were made. Examples of the calculation of the resistivity from the measurements are given below, using typical values.
9 Precision
The precision depends on the method of measurement, the reference materials used for calibration and the product examined. Some typical precision values are given in Table 1. Examples of the conductivity and resistivity to be expected for certain products are given in Table 2.
10 Test report
The test report shall contain at least the following information:
a) all information necessary for identification of the product tested (manufacturer, product
designation, batch number, etc.);
b) a reference to this document, i.e. ISO 15091:2019;
c) the test temperature;
d) the solvent, if the sample was diluted;
e) details of the measuring instrument and the measuring cell used for the test;
f) the test result, as indicated in Clause 8;
g) any deviation from the test method specified;
h) any unusual features (anomalies) observed during the test;
i) the date of the test.BS EN ISO 15091 pdf download.