ISO 5263-2:2004规定了机械纸浆的实验室 - 湿分解的装置和程序，其中没有展现延迟或纸浆，其中延迟已经被去除。在与纸浆相关的许多其他国际标准中准备测试部分需要该装置和程序。 原则上，该方法适用于不显示延迟的所有类型的机械纸浆（即机械，半化学和化学机械纸浆），包括来自机械纸浆的回收纤维。它不适用于展示使用ISO 5263-3中描述的分解程序的延迟的机械纸浆。 还应使用ISO 5263-2:2004规定的程序来分解要测量的所有机械纸浆的亮度

ISO 5263-2:2004 specifies an apparatus and the procedures for the laboratory-wet disintegration of mechanical pulps that do not exhibit latency or pulps where latency has already been removed. This apparatus and procedure are required for preparation of the test portion in a number of other International Standards dealing with pulps. In principle, this method is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemo-mechanical pulps) that do not exhibit latency, including recovered fibres from mechanical pulps. It is not suitable for mechanical pulps exhibiting latency for which the disintegration procedure described in ISO 5263-3 shall be used. The procedure specified by ISO 5263-2:2004 should also be used to disintegrate all mechanical pulps to be measured for brightness.