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<p>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.</p>
<p><b>Method A:</b> 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.</p>
<p><b>Method B:</b> The temperature is cycled continuously between a high temperature and a low temperature to introduce thermal stress in the test piece.</p>
<p>The counterforce is determined by means of a continuous-measurement system.</p>
<p>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.</p>
<p>The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments.</p>
Reģistrācijas numurs (WIID)
75642
Darbības sfēra
<p>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.</p>
<p><b>Method A:</b> 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.</p>
<p><b>Method B:</b> The temperature is cycled continuously between a high temperature and a low temperature to introduce thermal stress in the test piece.</p>
<p>The counterforce is determined by means of a continuous-measurement system.</p>
<p>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.</p>
<p>The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments.</p>
