UV exposure is the natural enemy of fair and delicate skin, and with the arrival of spring, can summer be far behind? I believe that when summer comes, sun protection will become a hot topic. When it comes to sun protection, there must be something called the sun protection index inseparable? Do you really understand the sun protection index? The sunscreen cosmetics are generally marked with SPF15, etc. with three letters and an Arabic numeral logo, which is actually the sun protection index logo. SPF is the abbreviation of the English SunProtectionFactor, that is, the sun protection index. For example, SPF15 is 15 times the strength of sun protection, assuming that a person in the absence of sunscreen sun 15 minutes skin began to appear red spots, then after smearing the SPF15 sunscreen, can ensure that she in 225 (15 × 15) minutes before sunburn skin, that is, about 225 minutes of sun protection time. Objectively speaking, the sunscreen index reflects the size of the sunscreen products UV protection ability. the higher the SPF index, the greater the protection given, the sunscreen products currently on the market coefficients ranging from 6 times to 40 times, the greater the multiplier, the longer the sun protection time, the better the sun protection effect; in the hot sunscreen promotions, businesses are most keen on SPF (sunscreen index) to make articles. Most brands are labeled “SPF30”, many famous brands are playing “SPF40” “SPF65” 么 sunscreen. Is the higher the sun protection index the better? The answer is: No! According to the general condition of Chinese skin SPF value only need 10 ~ 15 is enough, too high but will stimulate the skin, causing dermatitis and other skin diseases, serious will also cause inflammation after the pigmentation. So how to choose the right SPF value? There are two types of sunscreens: UV absorbers and UV shielding agents (such as titanium dioxide and zinc oxide ultra-fine powder). It is not possible to have a product with SPF of 20 or more without titanium dioxide. Sunscreens absorb UV rays while there is a certain amount of skin irritation, and if there is an excess of UV absorbers, it will also become a burden on the skin. Therefore, the choice of what kind of sunscreen to choose depends on your workplace, time and the intensity of the sun. If you work indoors and do not go out much, you can use SPF15 to SPF20 sunscreen products; if you need to work outside or travel on holidays, you can use products with SPF20 or more; if you travel to beach baths or tropical areas, you should choose sunscreen products with SPF30 or more. Specifically, the general type of skin people, SPF value to 8-12 is appropriate; people sensitive to light, SPF value to 12 ~ 20 is appropriate; sensitive skin should pick plant formulations or sunscreen containing titanium dioxide, can also use products containing vitamin E and preservative-free. When using fruit acid skin care products, they should be combined with physical sunscreens with a high SPF to prevent newborn skin from being harmed. This is because fruit acid skin care products can make the skin thinner, more fragile and less resistant to UV rays. In addition, the choice of sunscreen should also depend on skin tone and skin type. Fair-skinned people should preferably use sunscreens with an SPF of more than 30 to prevent the production of spots; dark-skinned people can use sunscreens with an SPF of 15 on weekdays. Oily skin should choose water-based sunscreens with strong permeability, and dry skin should choose cream sunscreens. To sum up, sunscreen is not the higher the sun protection index the better, according to their own skin type and work life needs to choose the right sunscreen is the correct sunscreen concept.