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sunscreen protective factor index |
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sunscreen protective factor index (SPF), a system of evaluating the effectiveness of various formulations for protecting the skin from actinic rays of the sun. Protective agents are rated from 1 to 50 by the U.S. Food and Drug Administration. A sunscreen protective factor of 15 means that the sunscreen provides 15 times the protection of unprotected skin. Among the most highly rated sunscreen lotions are nonopaque combinations of paraaminobenzoic acid ester and benzophenone, parol 1789 with incoxide and titanium dioxide. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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