Determination of SPF in vivo

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Test ProceduresUV-Protection Factor

In Europe sunscreens are classified and regulated as cosmetics and their efficacy is evaluated under standardized condition in accordance with the International Standard ISO24444:2010 Cosmetics –Sun protection test methods –In vivo determination of the sun protection factor (SPF) test method.

SPF is determined by the ratio of UV energy required to produce a minimal erythemal dose (MED) in protected skin (standardized application thickness of 2 mg/cm2) to unprotected skin and is a measure for the UVB-protection effectiveness of a sunscreen.

Positioning of irradiation unit.

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