SPF (Sun Protection Factor) is the value at the specified levels of UVB skin protection in the sunlight.SPF values specified beside sunscreen SFP15, whether it refers to the number of SPF50 SPF30 or folds of skin at the time we can withstand sunlight after the cream of that type go. For example, a person's skin, we can usually tolerate sunlight or UV resistance and UVB rays can get about 20 minutes if the sunscreen SPF30 carding, we specify a value, it means that after the cream and then. Our skin can withstand radiation in the UVB of sunlight equal to 20 x 30 = 600 minutes or 10 hours there himself.
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