ISO 2285:2013 pdf download.Rubber, vulcanized or thermoplastic – Determination of tension set under constant elongation,  and of tension set, elongation and creep under constant tensile load.
ISO 2285 specifies a number of methods of determining the dimensional changes in test pieces of vulcanized or thermoplastic rubber during and after tensile loading for relatively short periods under constant elongation or constant loading.
The constant-elongation test is intended to measure the ability of rubbers to retain their elastic properties after extension, at a standard laboratory temperature, to a specified strain which is maintained for a specified time at the same or at a specified higher temperature and then released at the test temperature or at the standard laboratory temperature.
The constant-load test specifies a method for the determination of elongation, creep and tension set of rubbers subjected to a constant load at standard laboratory temperature.
The test methods are intended to measure the elastic properties of rubber in the hardness range 20 IRHD to 94 IRHD.
The creep measurement is not recommended for product design or the evaluation of low-creep materials. For these, reference should be made to ISO 8013. No agreement between the results of this test and those of ISO 8013 should be inferred.
NOTE The constant-load test is primarily intended for the measurement of state of cure and the quality control of thin-walled products. An increase in the state of cure or degree of crosslinking is usually reflected in a decrease in set, creep or elongation.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 8013, Rubber, vulcanized — Determination of creep in compression or shear
ISO 18899:2004, Rubber — Guide to the calibration of test equipment
ISO 23529:2010, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply (see also the definitions of creep functions given in Iso 8013).
3.1
tension set at constant load
elongation remaining in a test piece in the unloaded condition after it has been subjected to a constant load during a specified time, expressed as a percentage of the original length in the unloaded condition
3.2
tension set at constant elongation
elongation remaining in a test piece in the relaxed condition after it has been subjected to a constant elongation during a specified time, expressed as a percentage of the elongation
3.3
creep
increase in elongation of a test piece at constant load during a specified time, expressed as a percentage of the elongation at the beginning of that time
4 Apparatus
4.1 Constant-elongation measurements.
ISO 2285 pdf download.