IEC TR 61026:1991

Foreword
Introduction
Clause
Section One - General aspects
1 Scope and object
2 General principles
3 Analytical methods for reaction rate measurements
Section Two - Test procedure A, Single reaction case
4 Range of application for procedure A
5 Reaction rate measurements in procedure A
6 Conventional ageing tests in procedure A
7 Evaluation in procedure A
8 Reporting in procedure A
Section Three - Test Procedure B, Multi-reaction case
9 Range of application for procedure B
10 Reaction rate measurements in procedure B
11 Calculations in procedure B
12 Conventional ageing tests in procedure B
13 Evaluation in procedure B
14 Reporting in procedure B
Section Four - Test procedure C, Multi-reaction with
diffusion
15 Range of application for procedure C
16 Reaction rate measurements in procedure C
17 Calculations in procedure C
18 Conventional ageing tests in procedure C
19 Evaluation in procedure C
20 Reporting in procedure C
Appendices
A Presentation of the theoretical principles of test
   procedures B and C
B References
Figures

Describes test procedures for evaluation of the thermal endurance of electrical insulating materials, based on the combined use of sensitive analytical methods for the determination of test acceleration and of conventional ageing tests. Describes the conditions to be observed in the test procedures and shows how characteristics corresponding to temperature index (TI) and halving interval (HIC) of IEC 60216 are derived from the test results.