ISO 6914:2021 PDF

Scope: This document describes three methods for the measurement of the change of stress in a test piece at a given elongation for the purpose of determining the ageing characteristics of a rubber. — Method A is intended for measurement under continuous strain conditions. — Method B is the preferred method for measurement under intermittent strain conditions. — Method C is an alternative to method B for measurement under intermittent strain conditions in which the test piece is removed from the ageing environment for measurement of the stress at standard laboratory temperature. Measurements at a single elevated ageing temperature can be used for quality control purposes as a measure of heat-ageing resistance. Measurements at a number of temperatures can be used for research and development purposes to estimate long-term ageing characteristics in accordance with the procedures described in ISO 11346. Tests under continuous and intermittent strain conditions measure the results of different processes, and hence do not give the same results. The results of the intermittent methods B and C also cannot be expected to be the same as they use different test conditions.

ISO 6914:2021 Referenced Document

ISO 18899:2013 Rubber - Guide to the calibration of test equipment
ISO 188:2011 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests
ISO 23529 Rubber - General procedures for preparing and conditioning test pieces for physical test methods
ISO 5893:2019 Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of traverse) — Specification

2021 ISO 6914:2021 Rubber, vulcanized or thermoplastic - Determination of ageing characteristics by measurement of stress relaxation in tension
2013 ISO 6914:2013 Rubber, vulcanized or thermoplastic.Determination of ageing characteristics by measurement of stress relaxation in tension
2008 ISO 6914:2008 Rubber, vulcanized or thermoplastic - Determination of ageing characteristics by measurement of stress relaxation in tension
2004 ISO 6914:2004 Rubber, vulcanized or thermoplastic - Determination of ageing characteristics by measurement of stress relaxation
1985 ISO 6914:1985 Rubber, vulcanized; Determination of ageing characteristics by measurement of stress at a given elongation