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).
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Test method
4.1 Outline of the method
4.2 Test subject selection
4.3 Test area
4.4 Product application
4.5 Water immersion procedure
4.6 Reference water resistant sun product
4.7 Determination of the minimum erythemal dose (MED)
4.8 Number of test subjects
4.9 Test chronology
5 Calculations and data handling
5.1 General
5.2 SPF before immersion
5.3 SPF after immersion
5.4 Individual percentage of water resistance
5.5 Mean percentage of water resistance
5.6 Calculation of lower confidence limit on the mean percentage of water resistance
5.7 Acceptance criteria for reference product P2
6 Test report
Annex A (normative) Simulated swim test device design
Annex B (normative) Test procedure and chronology
Annex C (normative) Standard reference sunscreen
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Test method
4.1 Outline of the method
4.2 Test subject selection
4.3 Test area
4.4 Product application
4.5 Water immersion procedure
4.6 Reference water resistant sun product
4.7 Determination of the minimum erythemal dose (MED)
4.8 Number of test subjects
4.9 Test chronology
5 Calculations and data handling
5.1 General
5.2 SPF before immersion
5.3 SPF after immersion
5.4 Individual percentage of water resistance
5.5 Mean percentage of water resistance
5.6 Calculation of lower confidence limit on the mean percentage of water resistance
5.7 Acceptance criteria for reference product P2
6 Test report
Annex A (normative) Simulated swim test device design
Annex B (normative) Test procedure and chronology
Annex C (normative) Standard reference sunscreen
Bibliography