IEC 60426:2007 

Electrical insulating materials - Determination of electrolytic corrosion caused by insulating materials - Test methods


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IEC 60426:2007 determines the ability of insulating materials to produce electrolytic corrosion on metals being in contact with them under the influence of electric stress, high humidity and elevated temperature. The effect of electrolytic corrosion is assessed in one test by using consecutively two methods:
- visual semi-quantitative method consisting in comparing visually the corrosion appearing on the anode and cathode metal strips, with those given in the reference figures. This method consists of the direct visual assessment of the degree of corrosion of two copper strips, acting as anode and cathode respectively, placed in contact with the tested insulating material under a d.c. potential difference at specified environmental conditions. The degree of corrosion is assessed by visually comparing the corrosion marks on the anode and cathode metal strips with those shown in the reference figures;
- quantitative method, which involves the tensile strength measurement, carried out on the same anode and cathode metal strips after visual inspection.
An additional quantitative test method for determining electrolytic corrosion, which involves tensile strength measurement of copper wire, is described in the informative Annex C.

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Additional information

Publication typeInternational Standard
Publication date2007-01-29
Available language(s)English, English/French
TC/SCTC 112 - Evaluation and qualification of electrical insulating materials and systemsrss
ICS17.220.99 - Other standards related to electricity and magnetism
29.035.01 - Insulating materials in general
Stability date  2025
File size1361 KB

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