本文件规定了通过比较浸水前（以下简称“静态”SPF）和浸水固定时间后（以下简称“湿”SPF）的防晒系数（SPF）来评估耐水性保持率的程序。

This document specifies a procedure for evaluating the water resistance retention percentage, by comparing the sun protection factor (SPF) before water immersion (hereafter referred to as the "static" SPF) and after a fixed period of water immersion (hereafter referred to as the "wet" SPF).