本文件规定了使用热轧机或烘箱测定生胶中挥发性物质含量的两种方法。 这些方法适用于测定ISO？1629中列出的“R”类橡胶中的挥发性物质含量。这些是具有不饱和碳链的橡胶，例如天然橡胶和至少部分来自二烯烃的合成橡胶。这些方法也适用于其他原橡胶，但在这些情况下，有必要证明质量的变化仅是由于实际挥发性物质的损失，而不是橡胶的降解。 热轧法不适用于天然橡胶、难以在热轧机上处理的合成橡胶或粉末或片状的合成橡胶。 这两种方法不一定给出相同的结果。因此，在有争议的情况下，烤箱法，程序？A，是参考方法。 注？附录A总结了每种试验方法对各种类型橡胶的适用性。

This document specifies two methods for the determination of volatile-matter content in raw rubbers by using a hot mill or an oven. These methods are applicable to the determination of the volatile-matter content in the “R” group of rubbers listed in ISO？1629. These are rubbers having an unsaturated carbon chain, for example natural rubber and synthetic rubbers derived at least partly from di-olefins. These methods can also be applicable to other raw rubbers, but in these cases it is necessary to demonstrate that the change in mass is due solely to loss of actual volatile matter and not to rubber degradation. The hot-mill method is not applicable to natural rubber, to synthetic rubbers which are too difficult to handle on a hot mill or to synthetic rubbers in powder or chip form. The two methods do not necessarily give identical results. Therefore, in the case of dispute, the oven method, procedure？A, is the reference method. NOTE？The applicability of each test method to various types of rubber is summarized in Annex？A.