UVA radiations have a wavelength between 320nm and 400nm, while long UVA is between 340nm and 400nm. Those represent 75% of UVA rays and 80% of the total solar radiations. They can pass through clouds or windows and can penetrate the deep layers of the skin to the dermis. Mainly responsible for immediate tanning, they however promote photo-induced skin aging and skin cancers. HelioScreen will soon offer a new test to evaluate this Long UVA rays protection (UVA I), based on the ISO 24443:2021 standard for the in vitro evaluation of the UVA-PF. The product is exposed to UV before spectrophotometric measurement to factor any photo-instability. The protection against Long UVA rays of a sunscreen product will be calculated over a shorter wavelength range yet crucial to be more protective for the consumer. HelioScreen offers 3 validation criteria : UVAPF-I, UVA I/UV ratio, and wavelength used so that the product can be claimed “Long UVA rays protection”.

👉 Discover more about Helioscreen expertise on the 🧫 preclinical testing platform : here