The sun protection factor of a sunscreen is a laboratory measure of the effectiveness of sunscreen — the higher the SPF, the more protection a sunscreen offers ... en.wikipedia.org
SPF, or sun protection factor, numbers were introduced in 1962 to measure a sunscreen's effect against UVB rays. To determine a sunscreen's SPF, testers ... health.howstuffworks.com
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Jun 24, 2009 ... Sun protection factor (SPF): A number on a scale for rating the degree of protection provided by sunscreens. SPF stands for Sun Protection ... www.medterms.com
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