NS EN ISO 2578 : 1ED 1999

National foreword
Committees responsible
Introduction
Method
1 Scope
2 Normative references
3 Definitions
4 Principle
5 Choice of test
6 Choice of end-point
7 Test specimens
8 Exposure temperature
9 Ageing ovens
10 Procedure
11 Evaluation of results
12 Determination of the relative temperature index
13 Test report
Annexes
A (normative) Calculation of the regression line
B (normative) Correlation coefficient
C (informative) Recommended test schedule for primary
    properties
Tables
A.1 Commonly used test temperatures, in degrees Celsius,
    corresponding values in kelvins with their reciprocal and
    reciprocal squared values
A.2 Sample calculation
Figures
1 Determination of the time to reach the end-point at each
    temperature - Property variation
2 Thermal endurance graph - Temperature index - Halving
    interval
3 Thermal endurance graph - Relative temperature index -
    Halving interval
A.1 Plot of regression based on sample calculation

ESSENTIAL TO READ BS 2782 pt0 BEFORE READING THIS METHOD Defines the principles and methods for evaluation of the thermal endurance properties of plastics exposed to elevated temperatures for long periods.