ISO 5263-3:2004规定了机械纸浆的实验室湿分解的装置和程序，其表现出延迟。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。 ISO 5263-3:2004适用于展现潜在时间的各种机械纸浆（即机械，半化学和化学机械纸浆）。不显示延迟的机械纸浆应根据ISO 5263-2进行分解。 应使用ISO 5263-2规定的程序来分解要测量的所有机械纸浆的亮度

ISO 5263-3:2004 specifies an apparatus and the procedures for the laboratory wet disintegration of mechanical pulps that exhibit latency. This apparatus and procedure are required for preparation of the test portion in a number of other International Standards dealing with pulps. ISO 5263-3:2004 is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemo-mechanical pulps) exhibiting latency. Mechanical pulps not exhibiting latency shall be disintegrated according to ISO 5263-2. The procedure specified in ISO 5263-2 should be used to disintegrate all mechanical pulps to be measured for brightness.