The SPF (Sun Protection Factor) allows the measurement of the level of protection that the product offers in the UVB part of the spectrum. In addition to SPF, a product can also claim water resistance properties.
Like the SPF determination, there are also several methods for assessing the water resistance of products. Depending on the marketing area, the method differs.

2 main methods for testing the water resistance of a product containing sun protection:

• Food and Drug Administration 21 CFR Parts 201 and 310 (June 2011) Labelling and Effectiveness Testing; Sunscreen Drug Products for Over-the-Counter Human Use
• GUIDELINES COLIPA 2005 associated with the standard NF EN ISO 24444: 2020 Cosmetics – Sun protection test methods – In vivo determination of the sun protection factor (SPF)

Which method to choose?

The method to be applied is defined according to the marketing area.