EN ISO 24443:2021

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

Publication date:   Feb 17, 2022

General information

60.60 Standard published   Dec 15, 2021


CEN/TC 392 Cosmetics

European Norm

71.100.70   Cosmetics. Toiletries



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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.

Life cycle


EN ISO 24443:2012


EN ISO 24443:2021
60.60 Standard published
Dec 15, 2021