The ALT‐<scp>SPF</scp> ring study – in vitro determination of the <scp>SPF & UVA‐PF</scp> by the fused method
The use of the Fused Method to determine the SPF of sunscreen formulations meets the statistical criteria for most PGs. However, intra-laboratory reproducibility needs to be improved for low SPF values and low viscosity emulsions. Nevertheless, this fast, simple, and cost-effective method remains a good alternative for SPF & UVA-PF screening in the development of sunscreen formulations. It is a pragmatic approach to manage the various known biases (applicator/device) of in vitro transmittance SPF measurement. No significant change to ISO 24443 is required, and the method allows in vitro SPF & UVA-PF to be determined in the same setup.
Authors
- Bertrand Colson (ORCID: https://orcid.org/0000-0003-4743-1150)
- J. Zur Lage
- Lygia S. Nogueira (ORCID: https://orcid.org/0000-0002-9464-3490)
- Niloufarsadat Mirmahdi Komjani
- A. Büchse
- José Carlos Ferrugem Moraes (ORCID: https://orcid.org/0000-0002-1230-9000)
- Bernd Herzog (ORCID: https://orcid.org/0000-0002-7647-7804)
- S. Acker
- A.G.M. Janssen
- Steef Peters
- Eva Perroux‐David
- F. Drulhon
Institutions
- Wyle (United States) (US)
- Merck KGaA, Darmstadt (Germany) (DE)
- Universidade Estadual de Campinas (UNICAMP) (BR)
- University College Capital (DK)
- Firmenich (Switzerland) (CH)
- DSM (Switzerland) (CH)
- BASF (Germany) (DE)
- Universidade Ibirapuera (BR)
- Délégation Provence et Corse (FR)
- Laboratoire d'Economie et de Sociologie du Travail (FR)
- Institute of Air Handling and Refrigeration (DE)
- Symrise (Germany) (DE)
Publication Details
- Journal
- International Journal of Cosmetic Science
- Published
- 2025-09-01
- DOI
- https://doi.org/10.1111/ics.70015
- Primary Topic
- Skin Protection and Aging
- Type
- article
- Field-Weighted Citation Impact
- 0.00