In late 2024, two long-awaited alternative SPF test methods were finally published: ISO 23675:2024 and ISO 23698:2024 [1]. What does this mean? How soon will these methods be adopted? Will their SPF always match the in vivo gold standard ISO 24444? And which of the three available official ISO methods will apply in case of discrepancies between them? This column will provide some answers.
1. Overview SPF-Methods…