NF ISO 3384-1, T46-043-1 (03/2024)

This document specifies two procedures for determining the reduction in the reaction force exerted by a specimen of vulcanized rubber or thermoplastic compressed under constant deformation and thus maintained at a predetermined test temperature. The reaction force can be determined using a continuous measuring system or a discontinuous measuring system. Two test methods are specified, Method A and Method B. In Method A, compression and all reaction force measurements are made at the test temperature and in Method B, compression and all Reaction force measurements are carried out at normal laboratory temperature. Method A and Method B do not give the same results, because in Method B the thermal shrinkage of the material when changing from the test temperature to the normal laboratory temperature is included in the result. Two shapes of test piece are specified in this document: cylindrical and annular test pieces. Comparison of results is only valid if it is made for specimens of similar size and shape. The use of annular specimens is particularly suitable for determining stress relaxation in liquid environments. This document deals only with constant, ambient or elevated temperature testing. Testing at temperatures below normal laboratory temperature is not specified. The methods have been implemented for low temperature testing, but their reliability has not been proven under these conditions.
(Automatic translation from French)