Sun Protection Guide
Masha Vorslav
even if today it is raining, the next three months will be mostly sunny. The editors of Wonderzine are especially sensitive to the question of the influence of solar radiation on the skin and therefore have compiled a guide to the not so simple world of the ultraviolet, sanskrins and SPF.
Ultraviolet
Any light is radiation. Sunlight in nature does not differ from other species, it also consists of waves of different frequencies and lengths, including ultraviolet - it is precisely this that is taken into account when it comes to sun protection. In fact, ultraviolet rays are not an absolute evil, and in low concentrations they are useful - the well-known vitamin D is produced better if you spend several minutes in the sun two or three times a week (rather than hours as everyone is used to). In larger amounts, ultraviolet is harmful - it causes wrinkles, significantly increases the likelihood of skin cancer and accelerates its aging in general.
There are several ways to protect against harmful radiation, and they need to be combined: wear clothes made of thick fabric, avoid direct sun from ten in the morning until four in the evening, and finally use sunscreen. And if with the first two everything is more or less clear, then with the latter everything is not very simple.
Sanskrins
There are two types of Sanskrins: chemical and physical. They differ greatly among themselves: the former absorb radiation and dissolve in water, while the latter dissipate ultraviolet light and are not washed away with water. Physical sanblocks are not absorbed into the skin (which is a plus), but, unlike chemical ones, they are rather sticky and viscous. It is best to choose products that combine both those and other properties - as a part of such creams, bisoctrizol should be indicated (in a different way, Tinosorb M). And yes, to consider the composition of funds is not only for zadrotov and generally not difficult, especially if you remember (or write down) only one name and look for it.
Even when choosing Sanskrins, it is necessary to look, from which types of UV radiation they shield. There are three types of ultraviolet rays: UVA, UVB and UVC, but the latter are almost completely absorbed by the ozone layer, so you need to look for protection only from the first two. Sunblocks that neutralize both UVA and UVB rays are not very common, and manufacturers do not miss the opportunity to mention this in capital letters on the packaging, so finding such tools is easy.
SPF
SPF (Sun Protective Factor) - This is an indicator of the degree of protection that a specific Sanskrin provides (by the way, not the only indicator). There are several aspects. The numbers after the designation 'SPF' will help to calculate how much time you can spend in the sun and not get burned - for this you need to multiply by the number of minutes in which you usually burn. For example, a sanblock with a factor of 15 will allow you to spend 75 minutes in the sun if you burn for five. One snag is that all Sanskrins lose their protective properties a few hours after application. That is, in spite of the fact that, in theory, a cream with SPF 50 should protect the skin for at least five hours, it will need to be washed off and reapplied somewhere in two to three hours, even if you spent them indoors (and if you had contact with water before).
But SPF is not only temporary, but also a qualitative indicator. The greater the value of the factor, the more UV rays they are blocked. True, this is not all about arithmetic progression: for example, SPF 2 neutralizes 50% of the rays, SPF 15 - already 94, and thirty - 97. By the way, the indicators of various tools do not overlap and do not provide more protection together 15 apply powder SPF 10, the overall protection will not be 25, but only 15.
The existence of creams with a very high (50 and higher) factor can be explained by the fact that the properties of the sanblocks directly depend on the uniformity and density of their application (therefore, the quality of some sunscreen powders and sprays is doubtful). Simply put, a cream with a low degree of protection must be applied with a very dense (approximately 30 ml of cream over the whole body) layer, which, frankly, will never be absorbed. But a Sanskrin with an SPF of 30 or 50 will give a comparable effect when using a much smaller amount of agent, and therefore such things are far from useless.
Summary:
SPF 30 is enough. 15 is not much worse, and 50 is not much better.
It is great if there are 'UVB', 'UVA' designations on the tube with sanxrin, and in its composition - bisooctrizol.
Moisturizers with “built-in” SPF protect no worse than independent sanblocks.
Hand cream and lip balm or lipstick, choose, if possible, also with SPF (at least 2, at least 10). And use them somewhere every three hours.
Using funds with SPF not only in summer and not only in sunny weather, you save the life of one kitten.
On the beach, after every swim or every two hours, apply sunscreen again (even if it is water resistant).
Do not give up your sanblock, just because it is heavy, viscous or whitens a little. That means he's good.
Apply it no less than 15 minutes before going outside.
And not only on the face, but on all open parts of the body.
Sunscreens are not the only sun protection. It is still better not to sunbathe between ten and four o'clock in the afternoon, and wear thick clothes, hats and glasses.
Illustrations: Masha Shishova