橡胶 - 通过硬度测量测定结晶效果

[中文适用范围]： 本文件规定了一种基于硬度测量的测试，用于确定由结晶引起的橡胶随时间逐渐变硬的情况。 它仅限于在测试温度为 10 IRHD 至 85 IRHD 时初始硬度的材料。 本方法适用于生胶、未硫化（混炼）胶和硫化橡胶。 它主要针对在寒冷气候下的温度下具有明显结晶倾向的橡胶，例如氯丁二烯和天然橡胶。 该方法不适用于快速结晶材料，这些材料在测试温度下调节的 15 分钟内结晶到相当程度。 [外文原描述]： This document specifies a test based on hardness measurements for determining the progressive stiffening of rubber with time, caused by crystallization. It is limited to materials having an initial hardness at a test temperature of from 10 IRHD to 85 IRHD. The method is applicable to raw, unvulcanized (compounded) and vulcanized rubber. It is mainly of interest for rubber with a marked crystallization tendency at temperatures experienced in cold climates, such as chloroprene and natural rubber. The method is not applicable to fast-crystallizing materials which crystallize to a considerable degree within the timespan of 15 min used for conditioning at test temperature.