SPF is mainly UVB protection index. Its meaning is: the extension to prevent drying out the red time in multiples.

The scientists testing, in the absence of any protection under the circumstances, the average ultraviolet radiation 15-20 minutes later, we will have the skin erythema.

SPF1 is an extension of times, that is not sunburn 15-20 minutes of time. That SPF15 is 15 times the Sun extended time. About 4-5 hours of sun time.

PA is the SPF UVA, and UVA + the number of representatives of the defense capability, initially originated from Japan, also common in Europe. PA + + + that have a strong ability to UVA sunscreen.

TIPS: a comprehensive understanding of melanoma, of course, we must continue to practice the whitening plan, in this spring and summer can be more lucent white, crystal.

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SPF, that is the Sun Protection Factor, the higher SPF value, the longer the sun protection. but the higher the SPF value is not better, the higher the skin “breathe” more difficult, some people will be alleric.

According to experts skin of the study, the most appropriate sun protection factor is between SPF15 to SPF30, because, in general, SPF15 products can block 93.3 percent of the UVB, and the SPF30 sunscreen can withstand the coefficient 96.6 percent of the UVB it. In addition, because of the high factor sunscreen products, relatively speaking greasy texture will be compared, thick, will easily lead to blocked pores of the phenomenon, and even breeding acne. And some of the high-chemical sunscreen factor sunscreen, after UVA exposure, the absorption of heat, most will be converted into other substances, leading to the phenomenon of skin allergies appear, therefore, we have to remind you in particular, in the selection of Sun protection products, in addition to sunscreen factor to consider, may wish to see more of its subsidiary components, or look at the first trial, and then do a final decision.

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Most people at the time of purchase sunscreen products, with more than sun protection factor (SPF) to choice, but will you certainly suitable for them?

In fact, at the time of purchase, in accordance with the best personal nature of work and living habits, colour depth and age of multi-factor for the integrated assessment. For example, the long-term indoor space OL, SPF 15 is enough to cope with the coefficient, if the outside must be in trouble often the best choice SPF20 above, and the usual preference for water sports for girls, coefficients should be upgraded to SPF 30 , Or even more, in addition, fair complexion who is also the best choice of more than SPF 30 sunscreen, to prevent the formation of spots. As for the partial skin deep crush on weekdays may be the product to SPF 15 protection.

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