A new in-vitro SPF test method for determining the efficacy of sun care products was proposed and evaluated. The test method is based on UV (Ultra Violet) dosage cumulate response using Gafchromic EBT3 film. In-vitro SPF value of 2 sunscreen standards and 15 commercial products, including sunscreen lotions, BB creams, foundations and sprays with organic and/or inorganic UV filters, were measured with both new and current methods. The new method is more accurate, cost effective, reproducible, and does not employ UV spectrophotometer compared to the current test methods.

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A new in-vitro method for determination of Sun Protection Factor