The two long-awaited new standards, alternatives to ISO 24444 for measuring SPF in cosmetic products, were published on 19 December 2024. They are now available in the International Organization for Standardization’s online shop.
ISO 23675:2024
It is entitled “Cosmetics — Sun protection test methods — In vitro determination of sun protection factor (SPF)”.
It is based on UVR transmittance spectroscopy, whereby spectrophotometric measurement of UVR transmission through appropriate UVR-transparent substrates, allows prediction of in vivo SPF values.
It is applicable to sunscreen products in form of an emulsion or alcoholic one-phase formulation, excluding in form of a loose or compressed powder or stick.
Its use is for the determination of a static sun protection factor. It is not applicable for the determination of water-resistance properties of a sun protection product.
It is available for purchase at CHF 177 (Swiss francs).
ISO 23698:2024
It is entitled “Cosmetics — Measurement of the sunscreen efficacy by diffuse reflectance spectroscopy”.
This hybrid diffuse reflectance spectroscopy method enables the 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.
It provides a non-invasive optical assessment of the protection provided by topically applied sunscreen products as measured in situ on …
