ISO 18861 is an international standard that discusses sun protection test methods for cosmetics.
ISO 18861 specifies a procedure for evaluating the water-resistance retention percentage, by comparing the sun protection factor (SPF) before water immersion and after a fixed period of water immersion.
ISO 18861 on the percentage of water resistance for cosmetics is applicable in:
The protection that cosmetic products containing organic or inorganic sunscreens provide against sunburn is neither absolute nor permanent due to the effect of water contact which affects the level of productivity.
ISO 18861 guides to make the sun products more effective by developing formulations that are more in large to the skin during water immersion. This provides for labelling the products as water-resistant or very water-resistant.
ISO 18861 gives you the procedure for water-resistant percentage calculation, based on the water immersion procedure, where the ratio is between before and after the bath sun protection factor (SPF). ISO 18861 provides you with the test methods that are beneficial for cosmetics like the outline of the method, testing of the subject, and the testing area, which is used insecurely testing the cosmetics.
By adopting ISO 18861 you can enhance the quality and efficiency of your cosmetic products by determining the percentage of water resistance correctly.
ISO 18861