标准编号：ISO 815-2:2008
中文名称：硫化橡胶或热塑性橡胶 压缩形变的测定 第2部分：在低温下
英文名称：Rubber, vulcanized or thermoplastic — Determination of compression set — Part 2: At low temperatures
发布日期：2008-02
标准范围
This part of ISO 815 specifies a method for the determination of the compression set characteristics ofvulcanized and thermoplastic rubbers at low temperatures.The method is intended to measure the ability of rubbers of hardness within the range 10 IRHD to 95 IRHD toretain their elastic properties at specified temperatures after prolonged compression at constant strain(normally ) under one of the alternative sets of conditions described. For rubber of nominal hardness80 IRHD and above, a lower compression strain is used: for a nominal hardness from 80 IRHD to 89 IRHDand for a nominal hardness from 90 IRHD to 95 IRHD.NOTE When rubber is held under compression, physical or chemical changes can occur that prevent the rubber returningto its original dimensions after release of the deforming force. The result is a set the magnitude of which depends on the timeand temperature of compression as well as on the time and temperature of recovery. At low temperatures, changes resultingfrom the effects of glass hardening or crystallization become predominant and, since these effects are reversed by raisingthe temperature, it is necessary for all measurements to be undertaken at the test temperature.
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