Laboratory methods for appraising the efficacy of sunscreens
K. H. Kaidbey , A. M. Kligman

Synopsis

APPRAISAL of a SUNSCREEN entails measurements of an ensemble of CAPABILITIES, viz., determination of the sun protection factor, resistance to sweating, wash-off and abrasion, capacity to form a horny layer reservoir and protection against long ultraviolet rays (UV-A).

There is a good correlation between results obtained in sunlight and in the LABORATORY with the xenon solar simulator, but not with other “sunlamps.”

Quantitative data are provided for a number of proprietory sunscreens ranging from chemical absorbers and physical blockers to polymeric film formers.

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