标准编号：ISO 815-1:2019
中文名称：硫化橡胶或热塑性橡胶 压缩形变的测定 第1部分：在环境温度或高温下
英文名称：Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At ambient or elevated temperatures
发布日期：2019-11
标准范围
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.
NOTE 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.
NOTE 2 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).
立即下载标准文件