EN ISO 23698:2025

Cosmetics - Measurement of the sunscreen efficacy by diffuse reflectance spectroscopy (ISO 23698:2024)

This document provides a procedure to characterize the sun protection factor (SPF), UVA protection factor (UVA-PF) and critical wavelength (CW) protection of sunscreen products without requiring biological responses. The test method is applicable for emulsions and single-phase products. The method has not been evaluated for use with powder forms sunscreen products.
This document gives specifications to enable determination of the absolute spectral absorbance characteristics of a sunscreen product on skin to estimate sunburn and UVA protection. It is applicable to products that contain any component able to absorb, reflect or scatter ultraviolet (UV) rays and which are intended to be placed in contact with human skin.

Kosmetische Mittel - Messung der Sonnenschutzwirkung mittels Diffusreflexionsspektroskopie (ISO 23698:2024)

Dieses Dokument enthält ein Verfahren zur Charakterisierung des Sonnenschutzfaktors (SSF), des UVA-Schutzfaktors (UVA-SF) und des Schutzes bei kritischer Wellenlänge (CW, en: critical wavelength) von Sonnenschutzmitteln, ohne dass biologische Reaktionen erforderlich sind. Das Prüfverfahren ist anwendbar für Emulsionen und einphasige Produkte. Das Verfahren wurde nicht hinsichtlich der Anwendung mit Sonnenschutzmitteln in Puderform beurteilt.
Dieses Dokument enthält Spezifikationen, welche die Bestimmung der absoluten spektralen Extinktionseigenschaften eines Sonnenschutzmittels auf der Haut ermöglichen, um den Sonnenbrand- und UVA-Schutz abzuschätzen. Es gilt für Erzeugnisse, welche jegliche Komponenten beinhalten, die ultraviolette (UV-)Strahlen absorbieren, reflektieren oder streuen können und dazu bestimmt sind, mit der menschlichen Haut in Kontakt gebracht zu werden.

Cosmétiques - Mesurage de l’efficacité des produits de protection solaire par spectroscopie de réflectance diffuse (ISO 23698:2024)

Le présent document fournit un mode opératoire pour caractériser le facteur de protection solaire (FPS), le facteur de protection UVA (FPUVA) et la longueur d’onde critique (CW) des produits de protection solaire sans nécessiter de réponse biologique. La méthode d’essai est applicable aux produits monophasés et aux émulsions. La méthode n’a pas été évaluée pour une utilisation avec des produits de protection solaire sous forme de poudre.
Le présent document fournit des spécifications pour permettre la détermination des caractéristiques absolues d’absorbance spectrale d’un produit de protection solaire sur la peau et ainsi estimer la protection contre les UVA et les érythèmes solaires. Il peut s’appliquer à des produits qui contiennent tout composant pouvant absorber, refléter ou diffuser les rayons ultraviolets (UV) et qui sont destinés à être mis en contact avec la peau humaine.

Kozmetika - Merjenje učinkovitosti zaščite pred soncem z difuzno refleksijsko spektroskopijo (ISO 23698:2024)

General Information

• Status: Published
• Publication Date: 07-Jan-2025
• ICS: 71.100.70 - Cosmetics. Toiletries
• Technical Committee: CEN/TC 392 - Cosmetics
• Drafting Committee: CEN/TC 392 - Cosmetics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 08-Jan-2025
• Due Date: 08-Jan-2025
• Completion Date: 08-Jan-2025
• Ref Project: SIST EN ISO 23698:2025 - Cosmetics - Measurement of the sunscreen efficacy by diffuse reflectance spectroscopy (ISO 23698:2024)

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2025
Kozmetika - Merjenje učinkovitosti zaščite pred soncem z difuzno refleksijsko
spektroskopijo (ISO 23698:2024)
Cosmetics - Measurement of the sunscreen efficacy by diffuse reflectance spectroscopy
(ISO 23698:2024)
Kosmetische Mittel - Messung der Sonnenschutzwirkung mittels
Diffusreflexionsspektroskopie (ISO 23698:2024)
Cosmétiques - Mesurage de l’efficacité des produits de protection solaire par
spectroscopie de réflectance diffuse (ISO 23698:2024)
Ta slovenski standard je istoveten z: EN ISO 23698:2025
ICS:
71.100.70 Kozmetika. Toaletni Cosmetics. Toiletries
pripomočki
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 23698
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2025
EUROPÄISCHE NORM
ICS 71.100.70
English Version
Cosmetics - Measurement of the sunscreen efficacy by
diffuse reflectance spectroscopy (ISO 23698:2024)
Cosmétiques - Mesurage de l'efficacité des produits de Kosmetische Mittel - Messung der
protection solaire par spectroscopie de réflectance Sonnenschutzwirkung mittels
diffuse (ISO 23698:2024) Diffusreflexionsspektroskopie (ISO 23698:2024)
This European Standard was approved by CEN on 22 November 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23698:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 23698:2025) has been prepared by Technical Committee ISO/TC 217
"Cosmetics" in collaboration with Technical Committee CEN/TC 392 “Cosmetics” the secretariat of
which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by July 2025, and conflicting national standards shall be
withdrawn at the latest by July 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 23698:2024 has been approved by CEN as EN ISO 23698:2025 without any modification.

International
Standard
ISO 23698
First edition
Cosmetics — Measurement of
2024-12
the sunscreen efficacy by diffuse
reflectance spectroscopy
Cosmétiques — Mesurage de l’efficacité des produits de
protection solaire par spectroscopie de réflectance diffuse
Reference number
ISO 23698:2024(en) © ISO 2024
ISO 23698:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 23698:2024(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions .1
3.2 Symbols .4
4 Principle . 5
5 Apparatus and test method . 5
5.1 In vitro UV spectrophotometer .5
5.2 In vitro substrate/plate .6
5.3 In vivo diffuse reflectance spectrometers (DRS) specifications .6
5.4 Monitoring the DRS systems .7
5.4.1 Monochromatic system .7
5.4.2 Polychromatic system.7
5.5 Test method .7
5.5.1 General .7
5.5.2 Subject exclusion criteria .7
5.5.3 Skin colour of the test subjects .8
5.5.4 Frequency of participation in tests .8
5.5.5 Number of test subjects.8
5.5.6 Ethics and consent .8
5.5.7 Study preparations .8
5.5.8 Unprotected skin remittance measurement .8
5.5.9 Training for Technician performing sunscreen application .9
5.5.10 Sunscreen application to test subject .9
5.5.11 Protected skin remittance measurements .9
6 In vitro spectrophotometer measurements .11
6.1 General .11
6.2 In vitro measurement preparation. 12
6.2.1 Blank reference PMMA plate . 12
6.2.2 Product application . 12
6.2.3 Product spreading . 12
6.2.4 Spreading for alcoholic products . 12
6.3 In vitro measurement . 13
6.4 Determination of A . 13
vt0
6.5 Determination of the UV exposure dose . 13
6.6 Measurement of in vitro sunscreen-treated plates post-irradiation .14
6.6.1 General .14
6.6.2 Calculation of the A (λ) post irradiated spectrum .14
vt1
6.7 Determination of the hybridization wavelength.14
6.7.1 Monochromatic system .14
6.7.2 Polychromatic system. 15
7 Spectral ratio of photo-degradation (S ) .15
RPD
7.1 General . 15
7.2 Determination of S (λ) .
...