Multi substrates – Recommendation n°26 by Cosmetics Europe via HelioScreen (now Weneos)

It is since a few months Cosmetics Europe recommendation on the use of alternative methods to ISO 24444:2019. For the past few years, HelioScreen has been performing this test in order to evaluate the Sun Protection Factor (SPF) which expresses the level of sun protection of a sunscreen product over the entire UV spectrum, using a multi-substrates approach (molded and sandblasted plates PMMA) on which the product has been spread and measured by means of a spectrophotometric method. This method allows for a higher correlation with in vivo results and the product is exposed to UV light to account for any potential photostability.