Summer is coming, how to make sunscreen a must-have for travel, masks are an effective tool for sun protection, but many people will find that there are many different masks on the market, so what masks can prevent UV rays? Let's analyze it for everyone:
      First of all, you must first know what the ultraviolet rays of the thousands of defenses are: the ultraviolet rays are part of the solar radiation and consist of three different bands:
UVB band wavelength 275 ~ 320nm, long-term or excessive exposure will make the skin tan, even red and swollen peeling.
The UVA band has a wavelength of 320~400nm and has strong penetrating power. It can directly reach the dermis layer of the skin and tan the old skin.
The UVC band has a wavelength of 200~275nm, and most of it is absorbed by the ozone layer and the cloud layer (this is not necessary for everyone's consideration).
      For sunscreen products such as several representative masks and masks on the market, you can do a sunscreen test and it is not difficult to see what masks can prevent UV rays! Under the same ultraviolet intensity, the change of ultraviolet intensity after masking by several masks is measured. After the occlusion, the remaining value is small, and the anti-ultraviolet effect is better. It is also possible to calculate the blocking ratio of ultraviolet rays (ultraviolet light reduction value / original ultraviolet value).
At 13 o'clock in the afternoon, when the sun is not covered by the clouds, the UV intensity value will probably be 2,450.
The first type: chiffon sunscreen mask, snow white translucent fabric printed with purple floral, fresh and elegant, can cover the face and neck, put on very fairy. Covered on the UV intensity meter probe for one minute, the display value stabilized at 821, blocking 66% of the UV rays.
The second paragraph: riding a sun mask, this is a professional riding equipment. Masks are generally made of Lycra fabric, sunscreen and radiation protection. The mask wraps around the head and neck and only reveals the eyes. When the ultraviolet light of the sun is maintained at 2465, the mask is placed on the ultraviolet intensity meter probe. After one minute, the display value stabilized at 41, blocking 98% of the UV rays.
The third type: swimming mask. The biggest feature of this mask is that it is too "sharp" after wearing it. The mask wraps both the head and neck. Only four holes are dug in the eyes, nose and mouth. Many netizens evaluate it like aliens and robbers. . When the ultraviolet light of the sun was maintained at 2455, the Chongqing Evening News reporter put the mask on the UV intensity meter probe. After one minute, the display value was 375, blocking 84% of the ultraviolet light.
The fourth type: pure cotton mask, when the ultraviolet light of the sun is maintained at 2450, the double-layer cotton mask is placed on the ultraviolet intensity meter probe. After one minute, the display value is actually 0, blocking 100% of the ultraviolet rays!
The four sunscreen masks have different levels of sun protection. The cotton has the best sunscreen effect, blocking 100% of the UV rays, and the chiffon mask has the worst sunscreen effect. So why is the mask resistant to UV rays?
The UV protection ability of the fabric is related to three aspects.
The first is thickness. The thickest cotton mask blocks 100% of the UV rays, while the thin chiffon mask has a much lower UV blocking capacity;
The second is the degree of density of the fabric. Although the swimming mask and the riding mask are equivalent in thickness, the swimming mask fabric has greater elasticity and a larger gap between the line and the line, so the ultraviolet blocking ability is poor. However, when the swimming mask is in contact with water, the water will form a coating on the mask to enhance the reflection of ultraviolet rays and improve the sun protection index.
The third is color. The dark fabric absorbs ultraviolet light, and the white fabric reflects a part of the ultraviolet light. It is not difficult to understand why the thin chiffon can block 66% of the ultraviolet light.
After understanding the principle of what kind of mask can protect against ultraviolet rays, you can also make a reference after purchasing sunscreen products in the future!
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