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ISO 815

2nd Edition, November 1, 1991

Complete Document

Rubber, Vulcanized or Thermoplastic - Determination of Compression Set at Ambient, Elevated or Low Temperatures

Includes all amendments and changes through Technical Corrigendum 1, April 1, 1993

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Superseded By: ISO 815-1

Additional Comments:
SAME AS BS 903 PA6*W/D S/S BY ISO 815-1 & 815-2
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Referenced Items:

ISO 1826
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Description / Abstract:

This International Standard specifies methods for the determination of compression set characteristics of vulcanized and thermoplastic rubbers at ambient, elevated or low temperatures.

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 (where possible 25 %) under one of the alternative sets of conditions described. For rubber of hardness greater than 80 IRHD, 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.


1    When rubber is held under compression, physical or chemical changes can occur that prevent the rubber returning to its original dimensions after release of the deforming force. The result is a set the magnitude of which depends on the time and temperature of compression as well as on the time and temperature of recovery. At elevated temperatures, chemical changes become increasingly more important and lead to a permanent set which can be measured by allowing test pieces to recover at standard temperature. At low temperatures, changes resulting from the effects of glass hardening or crystallization become predominant, and since these effects are reversed by raising the temperature it is necessary for all measurements to be undertaken at the test temperature (see ISO 6471).

2   Guidance for using the precision results is given in informative annex A, and results for compression set at -25 °C and 100 °C without lubricant in informative annex B.

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