NF T46-044

<p>ISO 3384:2005 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.</p> <p>Two forms of test piece are permitted: cylindrical test pieces and rings. The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments.</p> <p>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>