ISO 3384-2:2019
(Main)Rubber, vulcanized or thermoplastic — Determination of stress relaxation in compression — Part 2: Testing with temperature cycling
Rubber, vulcanized or thermoplastic — Determination of stress relaxation in compression — Part 2: Testing with temperature cycling
This document specifies two methods for determining the decrease in counterforce exerted by a test piece of vulcanized or thermoplastic rubber which has been compressed to a constant deformation and then undergoes temperature cycling. Method A: The temperature is cycled at intervals between a high temperature for ageing and a low temperature for checking the sealing force at this low temperature. Method B: The temperature is cycled continuously between a high temperature and a low temperature to introduce thermal stress in the test piece. The counterforce is determined by means of a continuous-measurement system. Two forms of test pieces are specified in this document: cylindrical test pieces and rings. Comparison of results is valid only when made on test pieces of similar size and shape. The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments.
Caoutchouc vulcanisé ou thermoplastique — Détermination de la relaxation de contrainte en compression — Partie 2: Essais avec cycles de température
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 3384-2
Second edition
2019-08
Rubber, vulcanized or
thermoplastic — Determination of
stress relaxation in compression —
Part 2:
Testing with temperature cycling
Caoutchouc vulcanisé ou thermoplastique — Détermination de la
relaxation de contrainte en compression —
Partie 2: Essais avec cycles de température
Reference number
ISO 3384-2:2019(E)
©
ISO 2019
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ISO 3384-2:2019(E)
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ii © ISO 2019 – All rights reserved
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ISO 3384-2:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Calibration . 3
7 Test piece . 3
7.1 Type and preparation of test pieces . 3
7.1.1 General. 3
7.1.2 Cylindrical test pieces . 3
7.1.3 Ring test pieces. 4
7.2 Measurement of dimensions of test pieces . 4
7.3 Number of test pieces . 4
7.4 Time interval between forming and testing . 4
7.5 Conditioning of test pieces . 4
8 Duration, temperature and test liquid . 5
8.1 Duration of test .
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