The concept of UVA-PF is the same as the SPF, i.e., it represents the extra time of sunlight exposure, but on this case the protection is specific for UVA radiation.
The methodology ISO 24442 is also used in human beings, and it consists in the determination of the minimum persistent pigmentation dose on unprotected skin (no product applied) and on protected skin (product applied). On that case, the erythema formation is not assessed, but the pigmentation formation, i.e., the formation of melanin (skin darkening). For that reason, this methodology is also known as the evaluation method of the persistent pigmentation dose (PPD), term introduced by the “Japan Cosmetic Industry Association” that published the first internationally accepted method to determine the UVA-PF.
According to the “Measurement Standards for UVA Protection Efficacy” methodology, described by JCIA, the efficacy of the UVA protection can be classified according to the obtained UVA-PF, as described in the table below.
|2 ≤ FP-UVA ≤ 4||PA+|
|4 ≤ FP-UVA ≤ 8||PA++|
|8 ≤ FP-UVA ≤ 16||PA+++|
|FP-UVA ≥ 16||PA++++|
Allergisa owns three 300W Multiport Solar Simulators that produce higher intensities of UVA radiation, enabling the enhancement and conduction of UVA-PF studies, in a shorter period of time when compared to 150W Multiport Systems.
We also take part in proficiency tests (interlaboratorial), in order to assure that our results are always close to the main labs in the world.
Our studies follow strict protocols and standardized by national and international resolutions or validated within the most strict quality concepts.SEE ALL SPF SERVICES