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© 1989 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists, Vol. 40, No. 3, 127-133


A new substrate to measure sunscreen protection factors throughout the ultraviolet spectrum
B. L. Diffey , J. Robson

ABSTRACT

Synopsis

A new method is described to assess sunscreen protection factors throughout the ultraviolet spectrum using Transpore™ tape, a readily available, inexpensive substrate. Spectroradiometric measurement of the transmission of ultraviolet radiation through the substrate with and without the sunscreen applied allows rapid determination of not only SPFs but also of the photoprotection afforded against long-wavelength ultraviolet radiation (UVA). A wide range of sunscreen products has been assayed using the substrate, and close agreement with published in vivo sun protection factors (SPF), including reference formulations defined by the FDA and DIN, has been obtained.

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© 1989 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists