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ISO 18861:2020
Cosmetics - Sun protection test methods - Percentage of water resistance
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).
International Organization for Standardization [iso]