EN ISO 24443:2012

Foreword
1 Scope
2 Terms and definitions
3 Principle
4 Apparatus
5 Test method
6 Procedure using the spreadsheet in this International
  Standard
7 Reference sunscreen formula S2
8 Test report
Annex A (normative) - Calibration of UV spectrophotometer
        and plate transmission test
Annex B (normative) - Radiometer calibration to
        spectroradiometric irradiance procedure
Annex C (normative) - Computation values: PPD and erythema
        action spectra and UVA and UV-SSR spectral irradiances
Annex D (normative) - PMMA test plate surface specifications
Annex E (normative) - UVA reference sunscreen S2
Annex F (informative) - Statistical calculations
Bibliography

ISO 24443:2012 specifies an in vitro procedure to characterize the UVA protection of sunscreen products. Specifications are given to enable determination of the spectral absorbance characteristics of UVA protection in a reproducible manner. In order to determine relevant UVA protection parameters, the method has been created to provide a UV spectral absorbance curve from which a number of calculations and evaluations can be undertaken. This method relies on the use of in vivo SPF results for scaling the UV absorbance curve.