What is the meaning of the numbers in the sunblockers ?!


Question: What is the meaning of the numbers in the sunblockers !?
like spf 55 or spf 70Www@Answer-Health@Com


Answers:
it was on yahoo a couple weeks ago, these experts says that 15 spf is not enought & 30 SPF is the recommended spf to put on b/c 15 SPF isn't enought!. & you always need to re-apply it every hour or so!.

- people forget to put sunblocks on their feet, face, shoulders, & neck!.


SPF means sun-protection factor!. The SPF numbers, multiplied by 10, indicate the number of minutes that the protective effects of the sunscreen or Sun Block with last!.

Therefore , SPF 5 = 50 minutes of protection and you have to reapply every 50 minutes - that's less than one hour and time consuming!. (I believe that SPF 5 sunscreen is actually no longer made, bu ti have seen SPF 8 = 80 minutes!.)

SPF 15 lasts 150 minutes, or 2 hours and a half!.
-- SPF 15 filters out or blocks 92% of UV(B) rays from the sun!. It allows an individual that would normally burn in 10 minutes to NOT burn for 150 minutes!.

SPF 30 lasts 300 minutes, or 5 hours!.
SPF 90 lasts for 900 minutes, or 15 hours (This is the highest SPF I have personally seen, at Walgreens in Ohio; I haver more often sceen SPF 60, 70 & 80)!.Www@Answer-Health@Com

I don't know what the specific numbers mean but they do represent the strength of protection you will get from the sun!. Although numerous studies have proven that anything with an spf over 30 is pointless and provides no more protection!. 30 blocks about 97% of the suns harmful rays and spf 15 blocks about 95%!.Www@Answer-Health@Com

Sun Protection Factor is a measurement of how much protection you have from the sun!. The SPF is the factor by which you would multiply a normal "burn" time to get the protected!.

For instance, a person who normally burns in 10 minutes, with an SPF of 15, can stay in the sun 150 minutes!.Www@Answer-Health@Com





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