ISO 815-2:2008 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

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

ISO 815-2:2008规定了在低温下测定硫化橡胶和热塑性橡胶压缩永久变形特性的方法。该方法旨在测量硬度在10 IRHD至95 IRHD范围内的橡胶在所述一组替代条件下，在恒定应变（通常为25%）下长时间压缩后，在规定温度下保持其弹性性能的能力。对于标称硬度为80 IRHD及以上的橡胶，使用较低的压缩应变:标称硬度为80 IRHD至89 IRHD时为15%，标称硬度为90 IRHD至95 IRHD时为10%。注:当橡胶处于压缩状态时，可能会发生物理或化学变化，从而阻止橡胶在释放变形力后恢复其原始尺寸。结果是一组，其大小取决于压缩的时间和温度以及恢复的时间和温度。在低温下，玻璃硬化或结晶效应引起的变化占主导地位，由于这些效应通过提高温度而逆转，因此所有测量都必须在试验温度下进行。

ISO 815-2:2008 specifies a method for the determination of the compression set characteristics of vulcanized 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 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.NOTE 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 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.

标准预览图