Abstract

This document specifies an in vitro procedure to characterize the UVA protection of sunscreen products. Specifications are given to enable determination of the spectral absorbance characteristics of UVA protection in a reproducible manner. In order to determine relevant UVA protection parameters, the method has been created to provide an UV spectral absorbance curve from which a number of calculations and evaluations can be undertaken. These include calculation of the Ultraviolet-A protection factor (UVA-PF) [correlating with in vivo UVA-PF from the persistent pigment darkening (PPD) testing procedure], critical wavelength and UVA absorbance proportionality. These computations are optional and relate to local sunscreen product labelling requirements. This method relies on the use of static in vivo SPF results for scaling the UV absorbance curve. This document is not applicable to powder products such as pressed powder and loose powder products.

Begin

2025-01-02

WI

00392060

Planned document number

DIN EN ISO 24443/A1

Project number

05702767

Responsible national committee

NA 057-07-01 AA - Cosmetics  

Responsible european committee

CEN/TC 392 - Cosmetics  

Responsible international committee

ISO/TC 217/WG 7 - Sun protection test methods  

draft standard

Cosmetics - Determination of sunscreen UVA photoprotection in vitro - Amendment 1 (ISO 24443:2021/DAM 1:2025); German and English version EN ISO 24443:2021/prA1:2025
2025-05
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previous edition(s)

Cosmetics - Determination of sunscreen UVA photoprotection in vitro (ISO 24443:2021, Corrected version 2022-02); German version EN ISO 24443:2021
2022-08

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