This test method provides a procedure to characterize the Sun Protection Factor (SPF), UVA Protection Factor (UVA-PF) and Critical Wavelength (CW) protection of sunscreen products without requiring biological responses. The method has been validated for emulsions and single-phase products. Specifications are given to enable determination of the absolute spectral absorbance characteristics of a sunscreen product on skin to estimate sunburn and UVA protection. It is applicable to products that contain any component able to absorb, reflect or scatter ultraviolet (UV) rays and which are intended to be placed in contact with human skin. This method is an alternative to ISO 24443 and ISO 24444 methods.