Generally speaking, the choice of SPF 15 ~ 30 of sunscreen on the skin sunscreen role has been enough, even in the ultraviolet radiation particularly strong weather, use the logo for products that can SPF30 no worries. But sometimes we still encounter the following problems, even if the highest coefficient of the use of sunscreen products will continue to skin sunburn.
It turned out that the effect of sunscreen mixed with more than a factor of sunscreen, and more with the actual applied sunscreen is closely linked to volume. Experts point out that in order to achieve the determination of sunscreen sunscreen achieve results, the volume of its provisions are applied 2mg/cm2. While the survey shows that the average consumer, the actual usage of only 0.5mg/cm2.
Scientific evidence shows that when the applied amount of sunscreen halved, its sunscreen effects decreased by 50% ~ 60%, can be seen that the same SPF value sunscreen smearing effects depend on the actual volume. In addition, the effect of the merits or demerits of sunscreen and re-apply sunscreen frequency has a direct relationship. Indoor workers, required qualification wiping one afternoon meeting, outdoor workers need to re-apply every two hours one time.
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