GB/T 9871-2008 (English Version) PDF

Standard No.: GB/T 9871-2008
Language: Chinese, Available in English version
Release Date: 2008
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 9871-2008
Replace: GB/T 9871-1988

Scope: This standard specifies three methods for measuring the stress change of a specimen under a given elongation state, with the purpose of determining the aging properties of rubber vulcanizates. Method A is for measurements under continuous strain conditions. Method B is the preferred method for measurements under intermittent strain conditions. In both cases A and B, the stress at the aging temperature is recorded using a stress relaxometer. Method C can be used instead of Method B for measurements under intermittent strain conditions. In method C, the specimen is removed from the aging environment and the stress is measured at standard laboratory temperature. Measurements at a single aging high temperature can be used for quality control purposes, such as the degree of heat aging resistance. According to the method described in GB/T 20028, measurements are made at a range of temperatures to predict long-term aging performance, which can be used for research and development purposes. There is no interpolation between the three methods, and the method used depends on the purpose of the experiment.

GB/T 9871-2008 Referenced Document

GB/T 2941 Rubber. General procedures for preparing and conditioning test pieces for physical test methods
ISO 18899:2004 Rubber - Guide to the calibration of test equipment
ISO 188:1998 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat-resistance tests
ISO 5893:2002 Rubber and plastics test equipment - Tensile, flexural and compression types (constant rate of traverse) - Specification

2008 GB/T 9871-2008 Rubber,vulcanized or thermoplastic.Determination of aging characteristics by measurement of stress relaxation
1988 GB/T 9871-1988 Rubber,vulcanized--Determination of ageing characteristics by measurement of stress at a given elongation