The Sunblock/Sunscreen Talk: SPF

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SPF or Sun Protection Factor is the rating used for sunblocks or sunscreens. Note that the SPF refers only to the Sun Protection Factor versus UVB rays only. Sun Protection Factor are normally between 1 to 60, but some products have higher SPF than 60. A sunscreen with a SPF 15 will delay sunburn from occurring for 15 times (in minutes) longer than normal if using no protection at all. Say, you burn after 30 minutes of sun exposure without any protection, then if you wear SPF 15, you'll burn after 450 minutes of sun exposure. So, the higher the SPF, the more time you can spend it under the sun without burning. Just don't forget to re-apply regularly.

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