Subject: What does SPF mean?
Date: Wed Apr 18 12:42:22 2001
Posted by Bud
Grade level: nonaligned
School: none
City: Gravenhurst State/Province: Ontario
Country: Canada
Area of science: Medicine
ID: 987612142.Me
Message:
How do you relate the SPF factor to the percentage of UV rays blocked?
Does SPF 30 block twice as much as SPF 15?
Re: What does SPF mean?
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