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ISO 2878:2017 pdf free

ISO 2878:2017 pdf free.Rubber, vulcanized or thermoplastic – Antistatic and conductive products – Determination of electrical resistance
The test shall be made with an instrument having a nominal open-circuit voltage of 500 V DC preferably an insulation tester (ohmmeter), or with any suitable instrument known to give comparable results.
The instrument shall be sufficiently accurate to determine the resistance within 10 % and shall not dissipate more than 3 W in the product.
The resistance values obtained will vary with the applied voltage, and errors can occur when low test voltages are involved. In cases of dispute, the voltage applied to the product shall be not less than 40 V,except where this conflicts with the requirement not to dissipate more than 3 W in the product.When a conductive liquid is used, the electrode contact area shall be completely wetted and shall remain so until the end of the test.
The conductive silver lacquer or colloidal graphite shall be dried in air at room temperature; the surface resistivity of the dried film shall be below 100 2.
Clean metal contacts shall be applied to the electrodes so that the contact area is approximately the same size as, but not greater than, the electrodes, unless otherwise specified.
The surface of the product shall not be deformed either during the application of the contacts or during the test, unless specified in the product standard. The product shall be supported on an insulating surface except when otherwise specified. The insulating surface shall be such that its volume resistivity is greater than 1010 0.m or sufficiently great that, when using two electrodes as described in 9.1 on the insulating surface, the resistance is too great to be indicated using the instrument used to test the product.
However, where very large products are being tested, it is permissible, by agreement between supplier and customer, to use the conditions prevailing in the factory, warehouse or laboratory, provided that the relative humidity is not more than 70 %. The temperature and humidity shall then be reported.
The minimum time-interval between product manufacture and testing shall be 16 h. Whenever possible, the time-interval between manufacture and testing should not exceed three months. In other cases, tests shall be made within two months of receipt of the product by the customer.ISO 2878 pdf free download.

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