Posts Tagged ‘ prod-528214 ’

How SPFs are Calculated

How SPFs are Calculated

If you’ve ever wondered exactly how those SPF numbers are calculated on your sunscreen, you’ve got some sunburnt volunteers to thank. SPF manufacturers test their products’ sun protection factor by slathering it on volunteers, at a rate of 2 mg of sunscreen per square centimeter of skin, and then blast them with UV rays...

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