summer is a burning season. It's time to have a big fireball on the top of your head and the baking ground is boiling hot. Some people are born with sensitive skin, and those who suffer from serious skin peeling are exposed to the sun. In order to protect themselves from the sun, many mm are using sunscreen, so which sunscreen is easy to use? Let's take a look
What is sunscreen preventing?
Every summer, people who love beauty will think of these two words. All kinds of sunscreen brands are cherished. But if you really want to ask: what exactly is the sun protection, most of you will think of the sun. So what is sun protection? Let's have a look.
We often say that sunscreen, generally refers to the prevention of 'ultraviolet' damage to us. And ultraviolet can be divided into: UVA, UVB, UVC. When UVC enters the atmosphere, it has been isolated under the protection of the ozone layer. Only UVA and UVB can radiate to the ground.
The real summer killers are UVB and UVA. UVB, also known as' outdoor ultraviolet ', can be isolated as long as they are blocked by proper physical shielding. It is the main cause of skin redness, inflammation and sunburn. UVA can refract into the room, also known as' indoor ultraviolet ', which can penetrate into the dermis and destroy collagen, elastic fibers and even fibroblasts, so UVA will not only stimulate pigment synthesis and make the skin' blacken '. It is also the main cause of skin aging and fine lines.
When choosing sunscreen products at ordinary times, the SPF we often pay attention to is actually specially used to fight against UVB. Different values of SPF index can provide different sunscreen effects in different periods of time. Its calculation method is as follows:
SPF10, said that assuming that the intensity of ultraviolet rays will not change with time, if a person without any sunscreen measures will turn red after 20 minutes in the sun, then after using SPF 10 sunscreen, in theory, he can stay in the sun for 20 (minutes) × 10 (SPF) = 200 minutes, and the skin will appear reddish; If sunscreen with SPF 15 is used, the duration of stay in the sun can be changed to 20 (minutes) × 15 (SPF) = 300 minutes, and so on.
How to protect the sun
But according to what we just mentioned, sun protection is UVA and UVB, and SPF can only be used to fight against UVB, but it can't help UVA, the real skin killer. Therefore, we need a more effective assistant to solve this problem, that is, PA +, PA + +, PA + + +, which we usually see in sun protection products. The effective protection time of a '+' is about 4 hours, that is to say, every increase of a +, the sun protection time will be 4 hours longer. Therefore, when choosing sunscreen, we can choose SPF value, plus PA plus to use, so that we can effectively resist the invasion of UV.
Can BB cream be used as sunscreen? Yes, the basic effect of skin79BB cream has sunscreen effect. So which BB cream is suitable for sunscreen in summer?
Here we recommend skin 79 Red Barrel BB Cream SPF25 / PA + + which is enough to resist normal sun protection.