How to choose the right sunblock, and what it contains
block? Isn’t it the brand, or the name? There are numerous amounts of sunblock products, but there are limited substances that can actually block uv rays, and these substances can also be divided into physical substances and chemical substances. In conclusion, sunblock is no exception to other basic cosmetics, you need to see what it is arranged of preferentially.
Physical substances – it reflects uv rays like a mirror
Chemicla substances – It is based on the principles of converting the uv rays into thermal energy. It takes apart the protein in our skin and has the ability to reflect the uv rays. However it cause allergies, so people with sensitive skin should take a test before actually using it.
SPF – The most eye-catching part when choosing the right sunblock. It refers to the rate of the ability in blocking UVB rays. In the case of SPF15, the block rate of UVB is 93%, in the case of SPF, it can block up to 98%. If you are looking for sunblocks for daily use. SPF15~20 will be appropriate.
PA – PA is the index for uva prevention. This standard was first made in Japan, if there is a + sign next to PA, it means it has 2~4times the better effect than without any cream used. If it has 2 +’s it refers to 4~8times the effect, if 3+’s it refers to more than 8times better effect.
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