NF ISO 3384-1

<p>ISO 3384-1-2011 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 maintained thus at a predetermined test temperature. The counterforce can be determined either by means of a continuous-measurement system or by a discontinuous-measurement one.</p> <p>Two forms of test piece are permitted: cylindrical test pieces and rings. Different shapes and sizes of test piece give different results, and comparison of results should be limited to 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.</p> <p>ISO 3384-1 deals only with testing at constant ambiant or elevated temperature. Testing at temperatures below standard laboratory temperature is not specified. The methods have been used for low-temperature testing, but their reliability under these conditions is not proven.</p>

Le présent document amende la norme NF ISO 3384-1:2012 en révisant l'annexe C "Programme d'étalonnage". Le code littéral utilisé dans le programme d'étalonnage a été ajouté et le programme d'étalonnage a été complée de façon Maire clairement apparaître les exigences de la norme.

<p class="MsoBodyText"><span lang="EN-GB">This document specifies two procedures 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 maintained thus at a predetermined test temperature.</span></p> <p class="MsoBodyText"><span lang="EN-GB">The counterforce can be determined either by means of a continuous-measurement system or by a discontinuous-measurement one.</span></p> <p class="MsoBodyText"><span lang="EN-GB">Two test methods are specified, method A and method B. In method A the compression and all measurements of counterforce are made at test temperature and in method B the compression and all measurements of counterforce are made at standard laboratory temperature.</span></p> <p class="MsoBodyText"><span lang="EN-GB">Method A and method B do not give the same results, as in method B the shrinkage of the material from the test temperature to standard laboratory temperature is included in the result.</span></p> <p class="MsoBodyText"><span lang="EN-GB">Two forms of test piece 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.</span></p> <p class="MsoBodyText"><span lang="EN-GB">The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments.</span></p> <p class="MsoBodyText"><span lang="EN-GB">This document deals only with testing at constant ambient or elevated temperature. Testing at temperatures below standard laboratory temperature is not specified. The methods have been used for low‑temperature testing, but their reliability under these conditions is not proven.</span></p>