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Description of BS ISO 815-1:2019 2019This document specifies methods for the determination of the compression set characteristics of vulcanized and thermoplastic rubbers at ambient (one method) or elevated temperatures (three methods, A, B, and C, depending on the way the test piece is released at the end of the test). The methods are intended to measure the ability of rubbers of hardness within the range 10Â IRHD to 95Â IRHD to retain their elastic properties at specified temperatures after prolonged compression at constant strain (normally 25Â %) under one of the alternative sets of conditions described. For rubber of nominal hardness 80Â IRHD and above, a lower compression strain is used: 15Â % for a nominal hardness from 80Â IRHD to 89Â IRHD and 10Â % for a nominal hardness from 90Â IRHD to 95Â IRHD. NOTEÂ 1 When rubber is held under compression, physical or chemical changes that prevent the rubber returning to its original dimensions after release of the deforming force can occur. The result is a set, the magnitude of which depends on the time and temperature of compression as well as on the time, temperature, and conditions of recovery. At elevated temperatures, chemical changes become increasingly more important and lead to a permanent set. NOTEÂ 2 Short-time compression set tests, typically for 24Â h, at elevated temperatures are commonly used as a measure of the state of cure, a means of material classification, and a specification to ensure the quality of a compound. Longer tests, typically for 1Â 000Â h, at elevated temperatures take account of the effect of ageing and are often used to predict service performance, including that of sealing materials. Short-time tests at ambient temperature show mainly the effect of physical changes (re-orientation of the molecular chains and the fillers).
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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