Characteristic

Understand the sun protection index accurately!

The sun protection index includes SPF and PA, which are the most intuitive expression values ​​of sun protection effect.

SPF is based on the skin’s lowest erythema dose, which is simply understood as the minimum sunburn duration. The following number represents the multiple relationship of the protection duration, that is, spf35 is the 10-minute sunburn base time extended by 35 times, making it 5.8 hours Sun protection time;

While PA blocks UVA in ultraviolet rays, its value represents the duration of sun protection for our skin become tan, usually “+” means the multiple relationship of extending the time of sun protection for our skin become tan, and each “+” extends 2~4 times, and so on. At present, the sunscreen products on the market are marked with SPF and PA values ​​at the same time, that is, they have the ability of sunburn and sunscreen at the same time. Consumers can choose the sunscreen with the appropriate index according to their own needs.

Some misunderstandings about sunscreen

1. The more sunscreen, the better. Body sunscreen is also said that generally a coin size is enough for face sunscreen, too much will hinder skin cell respiration;

2. The larger the sunscreen, the better. In fact, the higher the multiple, the more chemical ingredients such as titanium dioxide are added to the sunscreen, the higher the risk of skin burden, so in addition to long-term outdoor activities, it is recommended to use spf30~35 daily. 3. Face sunscreen can not remove makeup. Sunscreen is not the same as skin care products. It cannot be absorbed by the skin and needs to be cleaned with makeup removers.

正确认识防晒指数

防晒指数包括SPF和PA，它们都是防晒效果最直观的表达值。SPF的依据是皮肤最低红斑剂量，简单理解就是最低防晒伤时长，后面的数字表示保护时长的倍数关系，即spf35就是在10分钟的晒伤基础时间上延长35倍，使其有5.8个小时的防晒时长;

而PA阻挡的是紫外线中的UVA，其值代表防晒黑时长，通常用“+”表示延长防晒黑时长的倍数关系，每一个“+”延长2~4倍，以此类推。目前市面上的防晒产品都会同时标有SPF和PA值，即同时拥有防晒伤和防晒黑的能力，消费者可以通过自身的需求挑选适宜指数的防晒。

关于防晒霜的一些误区

1.防晒涂越多越好。身体防晒另一个说法，一般面部防晒使用一枚硬币大小就足够了，过多会妨碍皮肤细胞呼吸;

2.防晒倍数越大越好。其实倍数越高的防晒添加的防晒剂等化学成分越多，皮肤负担风险越高，所以除长时间的户外活动外，日常还是建议使用spf30~35就好。

3.面部防晒可以不卸妆。防晒霜不等同于护肤品，皮肤无法吸收，是需要用卸妆产品清洁的。