This part of IEC 60216 specifies general ageing conditions and the methods to be used to derive thermal endurance characteristics from them, and gives recommendations for the use of the detailed instructions and guidelines in other parts of the standard.
Although originally developed for use on electrical insulating materials and simple combinations of such materials, these methods are considered to be more generally applicable and are widely used to test materials not intended for use as electrical insulators.
In the application of this standard, it is assumed that a substantially linear relationship exists between the logarithm of the time required to produce the predetermined change in the property, and the reciprocal of the corresponding absolute temperature (the Arrhenius relationship).
For the standard to be valid, there should be no transitions, particularly first-order transitions, within the temperature range under consideration.
In the remainder of the text of this standard, the term "insulating materials" is always taken to mean "insulating materials and simple combinations of such materials".
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