Solar radiation will bring ultraviolet, which is a kind of light that we cannot see with our naked eyes. It is reported that too much ultraviolet into the body will cause skin cancer. Therefore, to keep our skin in a healthy state, we have to attach importance to sun protection measures.
Generally, ultraviolet is contained UVC, UVB, and UVA. Among them, the penetration of UVC is weak as it is basically isolated by the ozone layer. The penetration of UVB is weaker than UVA, but it will make our skin surface sunburn. As for UVA, the penetration of UVA is the strongest. It can directly penetrate into the dermis of our skin, causing wrinkles, sunburn, and aging of the skin.
A large number of people have the misconception that only needs to wear sunscreen under the strong sunlight. In fact, no matter what weather conditions, ultraviolet light exists, but the intensity of ultraviolet light will be more influential on sunny days than on cloudy days.
Since sunscreen is so important, what kind of sunscreen should we choose?
The sunscreen available in the market can be divided into physical sunscreen and chemical sunscreen.
Physical sunscreen refers to that the titanium dioxide and zinc oxide, which are small particles in sunscreens, will form a “mirror” on the skin surface and reflect the ultraviolet rays to other places so that the ultraviolet rays will not stimulate the skin.
However, sunscreen based on physical sun protection principle needs to be removed, because the small particles in it will block the pores of the face skin and cause other skin problems.
Chemical sunscreen refers to that a lot of chemicals are added into the sunscreen. These chemical substances have the function of absorption. They can achieve the purpose of sunscreen through the absorption of ultraviolet rays but will be more irritating to the skin than physical sunscreen.
Because the ultraviolet rays that can reach our skin are UVA and UVB. UVA is the leading cause of skin aging, such as wrinkles and age spots, while UVB leads to our skin sunburn. Therefore, when choosing a sunscreen, we should choose the sunscreen that can simultaneously block UVA and UVB, to adequately protect our skin.
Besides, when choosing a sunscreen, sunscreen with SPF value greater than 30 should come to your mind first. SPF (Sun Protection Factor) is a performance index of sun protection cosmetics to protect skin and avoid sunburn. The SPF value of sunscreen cosmetics often represents the protective effect index of UVB.
In 2011, the U.S. Food and Drug Administration released a mapping between SPF values and sun protection. Specifically, the SPF of 15 can prevent 93.3% of UVB radiation. In comparison, the SPF of 30 can filter 96.7% of UVB radiation, and the SPF of 50 is related to the prevention of 98% of UVB radiation.
There is another indicator that helps us to select the sunscreen, which is PA. PA refers to the anti-UVA index. Similarly, the more “+”, the stronger the ability against UVA. A “+” means that it can resist UVA for two hours, and every extra “+” means more two hours of protection.
There are a lot of niche sunscreens in the market with significant effect and high quality, such as Ausmetics, a company with 20 years of experience specializing in the production of natural skin care products.
Their sunscreens include physical sunscreen and chemical sunscreen, and the lowest SPF value is 30. Not only that, but the sunscreen in Ausmetics also has the texture of lotion and cream. You can choose a suitable sunscreen according to your own needs. Of course, if you have more questions about sunscreen, Ausmetics will also provide you with professional answers.