本文件规定了在实验室环境中测定吸水性的方法，并提供了浸水对耐久性影响的测量方法。浸泡后耐久性降低的计算方法为接收样品的耐久性与浸湿产品的耐久性之间的差异。

This document specifies a method for the determination of water sorption in a laboratory setting and provides a measure for how the durability is impacted as a result of immersion in water. Post-immersion durability reduction is calculated as the difference between the durability of the as-received sample and the durability of the wetted product.