Physical Testing of Rubber
Primarily intended as a reference for those directly concerned with testing rubbers, this book provides comprehensive coverage of the procedures for measuring the whole range of the physical properties of rubber.
TABLE OF CONTENTS Physical Testing of Rubber
Chapter 5: Conditioning and Test Atmospheres
OVERVIEW
The properties of rubber depend, often to a considerable extent, on its history before test and the atmospheric conditions under which the test was carried out. That is, the results are affected by the age of the rubber, the conditions such as temperature and humidity under which it was stored, any mechanical deformation before test and temperature and humidity at the time of the test. Hence, to produce consistent results it is essential that these factors are controlled within suitable limits.
It is usual to divide the period before test into storage and conditioning; where conditioning refers specifically to the process of bringing the test pieces to the required conditions of temperature and perhaps humidity immediately before test, and storage refers to the period before this back to the time of forming.
1 STORAGE
The properties of vulcanised rubbers change most rapidly immediately after vulcanisation but later, assuming that no accelerating influences are present, the changes become so slow as to be negligible over a period of, say, a few weeks. Hence, it is desirable that a minimum period is allowed between vulcanisation and testing. This minimum period is inevitably arbitrary, but has been standardized. It was previously given in a separate standard, ISO 1826, but has now been incorporated into ISO 23529 [1].
The object of having requirements given in a specific standard is to avoid variations in the wording and to avoid having to repeat it in each method. However, the essence of the wording is...
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