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KMID : 0604520110370020137
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Journal of the Society of Cosmetic Scientists of Korea
2011 Volume.37 No. 2 p.137 ~ p.141
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Study on the Sun Screen Test Method using Elipsometer
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Kim Joon-Woo
Lee Jong-Soo
Lee Ji-Hye
Choung Suk-Jin
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Abstract
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Sunscreen is divided into the organic agent of UV absorption and inorganic agent of reflection. These are evaluated by sun protection factor (SPF) in-vivo test requiring high cost and time, while in-vitro tests are adopted commonly because of short test time, easy result collection. Generally, test method of SPF use SPF 290a by UV-vis spectrometer. The evaluate by SPF 290 has low reproducibility. Although analysis using UV-vis spectrometer has high reproducibility, it is hard to separated results of transmission, adsorption, and reflection. In this study, suggested method of elipsometer has some merit such as high reproducibility, easy separation of transmission/adsorption/re- flection, analysis using various incident angle. We tested the validity of elipsometer for SPF measurement, using commercially available sun-block (SPF 50).
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KEYWORD
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UV screening agent, elipsometer, sun protection factor
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