它们来源于焦油一炼油的残留，它被用于橡胶和有些塑胶的增塑剂。它有以下背景。

They come from tar-oils, i. e. residues from oil refining, which are added to the rubber asp; asticizers, This has the following background.

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可直接对从橡胶制品中剥离出的增强纤维进行分析，也适用于表面有残留橡胶及其浸渍物质、难以分离完全以及仅有少量试样的橡胶制品中的增强纤维的剖析。

It was also suitable for the determination of the samples which contained residual rubber and its impregnated materials on the surface of fiber, which were difficult to be separated completely.

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