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SPF or sun protection factor is the measure of the amount of time taken by the sun light or more specifically the ultra violet rays to cause irradiation to the skin which is commonly known as sun burn on the protected skin. For example, if for your normal skin the time taken for irradiation is 30 minutes and after applying the cream the duration is 300 minutes, then the sun protection factor for that particular product is 300 divided by 30, that is SPF 10. Normally the time taken for irradiation by normal skin ranges from 20 to 30 minutes and so you can easily find how much SPF you need in your day cream by calculating the number of minutes you are exposed to the sun. With increased value of SPF, the number of minutes of protection increases. The SPF requirement increases with increasing time of exposure to the sun.
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What does the spf stand for?
spf stands for sun protection factor
What is spf of jojoba oil?
Jojoba oil has an SPF of 4.
How much SPF is in Neutrogena Lip Moisturizer?
It has an SPF of 15 (I know because I have it)
What spf number do doctors recommend when exposing yourself to the sun?
An SPF of about 30
What lip gloss has the highest SPF?
Neutrogena makes a spf 30 lipgloss.
Is there a spf 100?
Yes, Neutrogena makes it, it is called " Spectrum+ Advanced sunblock lotion SPF 100+." As matter of fact, I have seen SPF 110!!!
Does Beach Bum Tanning lotions have any SPF in them?
Currently Beach Bum Tanning Lotions do not contain SPF's. SPF's protect you skin from harmful rays.
What is the highest SPF facial sunblock can be purchased in?
It was probably SPF 30 because that blocks 96.7% of UVB rays. SPF 50 blocks 98% so you aren't really getting that much more protection than the SPF 30. Neutrogena has a SPF 100 but it really isn't necessary because as I said, SPF 30 is already blocking a significant amount, and SPF 50 doesn't even make that much more of a difference. Just for your information, SPF 100 blocks 99% of UVB rays so it REALLY doesn't do much more than SPF 50.
Does the SPF count?
"The Sun Protection Factor (SPF) displayed on the sunscreen label ranges from 2 to as high as 50 and refers to the product's ability to screen or block out the sun's harmful rays. For example, if you use a sunscreen with an SPF 15, you can be in the sun 15 times longer that you can without sunscreen before burning. Consumers need to be aware that SPF protection does not increase proportionally with an increased SPF number. While an SPF of 2 will absorb 50% of ultraviolet radiation, an SPF of 15 absorbs 93% and an SPF of 34 absorbs 97%." from http://www.melanomafoundation.org/prevention/facts.htm
Would adding spf 30 sunscreen to spf 50 sunscreen make it spf 80 sunscreen?
No. SPF 30 lets in 1/30 of burning UV rays, while SPF 50 lets in 1/50. Adding the two together is pointless and would not result in high levels of skin protection.
What rays does SPF block?
Should be UVA and UVB. Read the labels, and use at least SPF 15 up to SPF 30 if you are very fair or freckle easily.
What SPF is best?
The highest SPF I have located is 110 for both Face and Body: Face: Neutrogena Age Shield Face - SPF 110 Body: Banana Boat Kids Max Protect & Play Continuous Spray Sunscreen SPF 110 Banana Boat Ultra Defense Sunscreen Lotion SPF 110 Banana Boat UltraMist Sport Performance Sunscreen SPF 110
