BS ISO 1853:2011 pdf download – Conducting and dissipative rubbers, vulcanized or thermoplastic — Measurement of resistivity 3.5 Expression of results Average the three measurements of resistance for each test piece and calculate the resistivity, ρ , in Ω⋅m, as follows: where V is the measured potential, in V; w is the width of the test piece, in m; t is the thickness of the test piece, in m; l is the distance between the potentiometer electrodes, in m; I is measured current, in A. Report the median value of the resistivities of the three test pieces. 3.6 Test report The test report shall include the following information: a) sample details: 1) a full description of the sample and its origin, 2) the method of preparation of the test piece from the sample, for example moulded or cut; b) test method: 1) a full reference to the test method used, i.e. ISO 1853:2011, method 1, 2) the dimensions of the test piece used; c) test details: 1) the time, temperature and humidity of conditioning prior to the test, 2) the voltage applied to the current electrodes, 3) the current through the test piece, 4) details of any procedures not specifed in this International Standard; d) test results: 1) the median value of the resistivities of the three test pieces, 2) the individual average resistivity value for each test piece, if required; e) the date of the test. 4 Method 2 4.1 Apparatus and materials 4.1.1 Brass electrodes, with dimensions as given in Table 1 and Figure 3. These may be either made of solid brass or brass-plated. 4.1.2 Mould, suitable for use with brass electrodes. 4.1.3 Sheets of insulating material, with a volume resistivity greater than 10 13 Ω⋅m and a surface resistivity greater than 10 14 Ω. 4.1.4 Oven, capable of being controlled at (70 ± 2) °C. 4.1.5 Resistance-measuring instrument: Any suitable resistance-measuring instrument which does not dissipate more than 0,25 W in the test piece. 4.2 Test piece Each test piece shall be a rectangular strip of rubber bonded during moulding to brass electrodes, with the dimensions given in Table 1 and shown in Figure 3. Either clean the brass electrodes in dilute nitric acid, wash with distilled water and allow to dry, or clean them with emery cloth. If brass-plated electrodes are used, ensure that the cleaning treatment does not remove the plating. Do not apply...

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