scope:

Scope and object

This part of IEC 1244 is a technical report of type 2 which applies to procedures for predicting ageing at low dose rates.

The object of this report is to present three methods which have been used to extrapolate data obtained from high dose rate experiments to the low dose rates typical of service conditions. These methods assume that homogeneous oxidation has been achieved under the test conditions. The techniques described in the following clauses are research methods which have been found to be useful for a range of elastomeric and thermoplastic materials and some thermosets, and are subject to continuing research. The procedures require a considerable number of test data to enable predictions to be made under low dose rate conditions. The power law extrapolation method (clause 2) has mainly been used for isothermal data whereas the superposition methods (clauses 3 and 4) can make use of data obtained over a range of temperatures.