Cosmetics - Sun protection test methods - In vitro determination of sun protection factor (SPF) (ISO 23675:2024)

This document establishes a recognized methodology for determining the Sun Protection Factor of cosmetic products through in vitro techniques. It provides a structured framework for evaluating the efficacy of sunscreens without relying on human or animal testing, aligning with modern ethical standards and scientific accuracy. The procedure outlines specific protocols for sample preparation, instrumentation calibration, and data analysis to ensure consistent and reproducible results across different laboratories. By defining precise measurement parameters and calculation methods, the text facilitates the assessment of UV radiation protection capabilities. This approach allows manufacturers and regulatory bodies to verify product claims regarding sun protection performance under controlled conditions. The methodology is designed to complement existing testing regimes and offers a reliable alternative for assessing the safety and effectiveness of sun care formulations. Adherence to these procedural guidelines ensures that the reported protection levels accurately reflect the product's capability to shield skin from harmful solar radiation.