About the multiple of sun protection, sun protection isolation. Consult a genius

For the yellow race, it is calculated as follows: generally, the skin of the yellow race can resist sunlight 15 minutes without being sunburned, so using SPF 15 anti-ultraviolet products will have a sunscreen time of about 225 minutes. Objectively speaking, the level of sun protection index reflects the ultraviolet protection ability of sun protection products. The higher the SPF index, the greater the protection, but the increase of SPF value is not proportional to the ability to shield ultraviolet rays.

Generally speaking, products with the lowest SPF 2 ~ 6, medium SPF2~6 ~ 8, high SPF6~8 ~ 12 and SPF value of 12 ~ 20 are high-intensity sunscreen products, and products with SPF value of 20 ~ 30 are ultra-high-intensity sunscreen products. However, there are many people who like to bask in the sun abroad, so the index of sunscreen products designed is relatively high, and some even reach SPF80.

China does stipulate that the highest SPF can only be written as 30, but the actual sun protection index is recommended to refer to the index given by the origin of cosmetics. Therefore, sunscreen products exceeding 30 will basically add+after SPF30 to indicate the number of times of exceeding.

Let's talk about PA:

It has been scientifically confirmed that UVA- 1 is the killer of skin aging, so Japanese scientists have developed a sunscreen that specifically resists UVA- 1 and used "+"to indicate the defense strength. The correct statement of PA is to protect UVA- 1, and its degree is marked with+,++and++. The more "+",the better the anti-UVA effect.

If you carefully observe the sunscreen products on the market now, you will find that many sunscreens not only have SPF value, but also have clearly marked PA value. Because SPF is aimed at UVB ultraviolet rays, that is to say, it can only defend the total amount of ultraviolet rays on the ground 1%, but it can't do anything about the real sunshine killer UVA. Therefore, sunscreen products for UVA will play a more effective role. Products marked with PA have such a function, which can reach the bottom of dermis in the shortest time and prevent ultraviolet rays from damaging elastic fibers and causing skin aging.

Usually, the strength of PA is represented by+,and one more+means that the effective protection time is prolonged. Specifically:

The effective protection time of PA+ is about 4 hours.

The effective protection time of pa++ is about 8 hours.

Pa+++ super protection.

Sunscreen isolation:

Many sunscreen products combine the efficacy of sunscreen and isolation into the same 1 product, most of which are from Japan and South Korea. This kind of products can not only be used as sunscreen, but also as foundation, which can be described as a combination of multiple functions. There is no doubt that it can be used together, but it is best to isolate it in front and protect it from the sun.

Isolation cream is an important step to protect makeup and skin. If you don't use cream to apply foundation, it will clog pores and hurt the skin, and it is also easy to cause the foundation commonly known as "eating" to fall off. The purpose of using sunscreen before makeup is to provide a clean and gentle environment for the skin and form a "front line" against external invasion.

For other relevant information and how to choose sunscreen, you can refer to the following:

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