This document specifies a procedure of water immersion for the in vivo determination of the water resistance of sunscreen products.

This document is applicable to products intended to be placed in contact with human skin including any component able to absorb, reflect or scatter UV rays and which, in addition, are designed to be less readily removed from the skin by water and/or during water immersion. It is intended to be read in conjunction with ISO 24444.

This document includes information about trest criteria and water immersion procedure with for example:

  • Selection of the test subjects
  • Test area
  • Product application
  • Room conditions
  • Water quality
  • Immersion sequencing cycle
  • Positioning of test subjects
  • Drying after immersion
  • Water quality and condition
  • Etc.