title: Methods for water resistance testing of sun protection products.
abstract: Synopsis Water resistance of sun protection products has been found to be best determined by the following methods: (1) Tests for determining UVL filter adherence to merino wool; this gives a rough value for orientation. Values in excess of 6% are suggestive of satisfactory adherence. (2) Tests for determining water resistance of sunscreen products on pig skin constitute a further essential step. Values in excess of 50% provide a realistic basis for tests in humans. In addition to filter adherence the product base, i.e. primarily the emulsifiers, are of special significance. Adequate results can be obtained with both W/O and O/W systems. Tests on volunteers are best done at the time of determining the sun protection factor, i.e. when simulating the events during a 2-3 h sunbath. Simulation should involve a single application of the test product in a pre-defined quantity and all activities conmmonly done in sunlight, e.g. swimming, as well as intermittent exercises to induce sweating. Values are considered as excellent, if 1 MED is not exceeded after 3 h exposure. Sun protection products with this characteristic qualify as adequate 'all-day' sunscreen for individuals with average sensitivity.
authors.affiliation: Greiter AG Research, A-3400 Klosterneuburg-Vienna, Austria.
authors.forename: F
authors.initials: F
authors.lastname: Greiter
authors.forename: P
authors.initials: P
authors.lastname: Bilek
authors.forename: S
authors.initials: S
authors.lastname: Doskoczil
authors.forename: J
authors.initials: J
authors.lastname: Washüttl
authors.forename: F
authors.initials: F
authors.lastname: Wurst