What does SPF40 mean and how long does it protect against the sun?
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Sunscreen is common and has different brands. So what does sunscreen SPF40 mean? How long can SPF40 sunscreen protect against the sun? What does SPF40 mean in sunscreen? This means 40 times sun protection. SPF stands for sun protection index. The higher the sun protection index, the stronger the sun protection ability. You should choose the appropriate sun protection index according to your skin. The higher the sun protection index, the better! Different SPF values mean different effective sun protection times. Specifically: SPF 15 = 15* 10 = 150 minutes SPF 20 = 20* 10 = 200 minutes SPF 30 = 30* 10 = 300 minutes SPF 50 = 50* 10 = 500 minutes. How long does spf40 sunscreen last? SPF40 means the sun protection time is 400 minutes Sun Protection Factor (SPF) refers to the ratio of the energy required to produce the smallest erythema on skin protected by sunscreen to the energy required to produce the same degree of erythema on skin without any protection. Simply put, it is the multiple of the time the skin can resist ultraviolet rays. Okay, now you know what sunscreen spf40 means. |
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