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

Overview

EN ISO 24443:2021 - adopted and corrected as EN ISO 24443:2021 (Corrected version 2022-02) - defines an in vitro test method to characterize the UVA photoprotection of topical sunscreen products. The standard specifies procedures to obtain a reproducible UV spectral absorbance curve for a sunscreen applied to PMMA substrate plates and describes optional calculations such as the Ultraviolet-A protection factor (UVA‑PF), critical wavelength, and UVA absorbance proportionality for product labelling. The method is not applicable to powder cosmetics (pressed or loose powders).

Key topics and technical requirements

Purpose: Measure UVA protection (320–400 nm) in vitro to complement SPF (in vivo) data.
Spectral absorbance curve: Generate a UV transmission/absorbance spectrum through sunscreen-treated PMMA plates for subsequent computations.
UVA‑PF calculation: Provides an in vitro UVA‑PF that correlates with in vivo PPD (persistent pigment darkening) testing; computation is optional and used for regulatory or labelling needs.
Critical wavelength: Optionally calculated from the spectral curve to assess broader-spectrum UVA coverage.
Scaling requirement: Relies on static in vivo SPF (e.g., ISO 24444 results) to scale the in vitro absorbance curve.
Test substrates: Accepts moulded and sandblasted PMMA plates (with specified surface/transmission characteristics); product application parameters differ (e.g., sandblasted plates use 1.2 mg/cm²).
Equipment & calibration: Specifies spectrophotometer and UV exposure source requirements, radiometer calibration, monitoring, and plate transmission validation.
Quality criteria: Introduces a coefficient “C” (accepted range 0.6–1.6 under defined conditions) and limits UVA irradiation dose (maximum 36 J/cm²).
Scope exclusions: Explicitly not for powder products such as pressed or loose powders.

Applications and users

Cosmetic R&D and formulation scientists assessing UVA protection performance during product development.
Third‑party testing laboratories performing in vitro UVA‑PF and critical wavelength evaluations for regulatory compliance and labelling.
Regulatory authorities and compliance teams verifying UVA claims on sunscreen labelling.
Quality control groups using reproducible in vitro procedures to track batch performance and photostability.

Related standards

ISO 24444 (in vivo SPF determination) - used for the static SPF scaling required by ISO 24443.
COLIPA/EU guidance referenced in the method's principles (historical background for UVA in vitro methods).

EN ISO 24443:2021 is essential for manufacturers and test labs aiming to substantiate UVA protection claims, provide balanced broad‑spectrum information alongside SPF, and comply with regional labelling requirements.

EN ISO 24443:2021 PDF

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Abstract

Overview

Key topics and technical requirements

Applications and users

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Технические детали

ISO 24443:2021

Cosmetics — Determination of sunscreen UVA photoprotection in vitro

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SIST EN ISO 24443:2022/A1:2026

Cosmetics - Determination of sunscreen UVA photoprotection in vitro - Amendment 1 (ISO 24443:2021/Amd 1:2026)