BS ISO 815-1:2019 - Rubber, vulcanized or thermoplastic. Determination of compression set. At ambient or elevated temperatures
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BS ISO 815-1:2019

Rubber, vulcanized or thermoplastic. Determination of compression set. At ambient or elevated temperatures

Status : Current   Published : November 2019



This 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 10 IRHD to 95 IRHD to retain their elastic properties at specified temperatures after prolonged compression at constant strain (normally 25 %) under one of the alternative sets of conditions described. For rubber of nominal hardness 80 IRHD and above, a lower compression strain is used: 15 % for a nominal hardness from 80 IRHD to 89 IRHD and 10 % for a nominal hardness from 90 IRHD to 95 IRHD.


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.


Short-time compression set tests, typically for 24 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 1 000 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).

Standard NumberBS ISO 815-1:2019
TitleRubber, vulcanized or thermoplastic. Determination of compression set. At ambient or elevated temperatures
Publication Date27 November 2019
Normative References(Required to achieve compliance to this standard)ISO 18899:2013, ISO 188:2011, ISO 23529:2016
Informative References(Provided for Information)ISO/TR 9272, ISO 4287, ISO 19983
ReplacesBS ISO 815-1:2014
International RelationshipsISO 815-1:2019
Draft Superseded By18/30374432 DC
DescriptorsVulcanized rubber, Elasticity, Compression set, Compression testing, Specimen preparation, Mechanical testing, Test specimens, Temperature, Thermoplastic polymers, Rubber, Test equipment
Title in FrenchCaoutchouc vulcanisé ou thermoplastique. Détermination de la déformation rémanente après compression À températures ambiantes ou élevées
ISBN978 0 539 00205 8
File Size2.428 MB

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