本文件规定了防晒产品UVA防护特性的体外程序。本规范旨在以可复制的方式确定UVA防护的光谱吸收特性。 为了确定相关的UVA保护参数，创建了该方法，以提供一条UV光谱吸收曲线，从该曲线可以进行大量计算和评估。其中包括计算紫外线-A保护因子（UVA-PF）[与持续性色素变暗（PPD）测试程序中的体内UVA-PF相关]、临界波长和UVA吸光度比例。 这些计算是可选的，与当地防晒产品标签要求有关。该方法依赖于使用静态体内SPF结果来缩放UV吸光度曲线。 本文件不适用于粉末产品，如压制粉末和松散粉末产品。

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.