What is SPF? The letters SPF stand for Sun Protection Factor, - TopicsExpress



          

What is SPF? The letters SPF stand for Sun Protection Factor, which rates a products ability to screen or block the suns harmful rays. Its expressed as the extra length of time you can stay in the sun before burning. So, if a fair skinned woman who would usually burn in six to seven minutes uses SPF 15 skincare, she can safely be exposed to sun for 90 minutes - or 15 times longer. Higher SPF ratings are not proportional: SPF 15 sunscreen offers 93% absorption and filtering of UVA and UVB sunlight, compared to SPF 30 which offers 97%.
Posted on: Thu, 20 Mar 2014 08:30:00 +0000

Trending Topics



Recently Viewed Topics




© 2015