本文件规定了测定试样长期吸水率的设备和程序。适用于隔热产品。 本文件规定了两种方法: -方法1:部分浸泡； -方法2:完全浸泡。 部分浸没的长期吸水率旨在模拟长期水暴露引起的吸水率。 全浸法的长期吸水率与现场条件没有直接关系，但在某些应用中已被视为某些产品的相关试验条件。

This document specifies the equipment and procedures for determining the long-term water absorption of test specimens. It is applicable to thermal insulating products. This document specifies two methods: — Method 1: Partial immersion; — Method 2: Total immersion. The long-term water absorption by partial immersion is intended to simulate the water absorption caused by long-term water exposure. The long-term water absorption by total immersion is not directly related to the conditions on site, but has been recognized as a relevant condition of test for some products in some applications.