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Standards Development
This document specifies a merged in vitro test method for the determination of sun protection parameters, specifically for:
• Sun Protection Factor (SPF)
• UVA Protection Factor (UVA-PF)
• Critical wavelength
• Water resistance
The method is applicable to sunscreen formulations, excluding products in the form of loose or compressed powders.
The document provides specifications for sample preparation, product application, irradiation conditions, spectral measurements, water exposure procedures, data processing, and reporting, enabling determination of the above parameters in a reproducible and comparable manner.
The document is intended for laboratory use and does not establish regulatory requirements, minimum protection thresholds, or labelling rules, which remain under the responsibility of relevant authorities.
At present, different standardized testing methodologies addressing specific aspects of sun protection performance exist, notably for SPF and UVA protection, using similar scientific principles, equipment, substrates, and analytical approaches, while being covered by separate standards.
This fragmentation results in:
• Multiple tests performed on the same product
• Increased testing costs and resource use
• Increased complexity for laboratories
The purpose of this project is to provide a single coherent test protocol to determine one or several sun protection parameters (SPF, UVA-PF, critical wavelength and water resistance) by merging existing and new in vitro methodologies.
Such a merged approach would:
• Reduce the number of separate tests required
• Simplify laboratory workflows
• Provide a single reference standard for in vitro sun protection testing
• Further improve reproducibility and comparability of results
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