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Physical and Chemical Sunscreens Differences and Pros and Cons Inventory Do you need to remove your makeup for physical sunscreens?
2024-05-28 14:13:28
1. The difference between physical sunscreen and chemical sunscreen
With the popularization of beauty knowledge, the principles of sun protection have gradually divided into camps. Mechanically, sunscreens can be divided into physical sunscreens and chemical sunscreens, which are what we often call physical sunscreens and chemical sunscreens. At present, there are also some sunscreen products on the market that combine physical sunscreen and chemical sunscreen, in order to take into account the lightness and instant effect of sunscreen. So what is the difference between physical sunscreen and chemical sunscreen?
1. Different sun protection mechanisms
Physical sunscreens work by refracting and scattering ultraviolet rays. Physical sunscreen is like putting a layer of protective clothing on the skin. The ultraviolet rays that hit the surface of the skin are blocked by it and cannot enter the skin. Common physical sunscreens include titanium dioxide, zinc dioxide, etc. Zinc oxide can be used in dermatology to treat eczema, dermatitis and other diseases, and can be used in sensitive skin areas such as around the eyes. Therefore, products based on this sunscreen are non-irritating. , suitable for sensitive skin and relatively safe. At the same time, it has a relatively broad sun protection spectrum and good stability, so its sun protection ability is relatively strong. However, the disadvantage is that the texture is slightly thick and tends to turn white when applied to the skin surface. Another advantage of physical sunscreen is that you can apply it immediately without waiting.
Chemical sunscreens work differently from physical sunscreens by absorbing ultraviolet rays and converting them into heat energy to prevent ultraviolet rays from causing damage to the skin. The advantage of chemical sunscreen is that it is light and non-sticky. The disadvantage is that it has poor photostability and needs to be reapplied repeatedly when exposed to the sun for a long time. In addition, chemical sunscreens need to be applied about 20 minutes before going out to exert their sunscreen effect. In addition, there are many chemical sunscreen additives, and long-term use will cause certain damage to the skin.
2. Different levels of absorption
Physical sunscreens are not absorbed by the skin, are chemically inert, and do not react with other products, so they are less likely to cause skin allergies.
Chemical sunscreens are easily absorbed by the skin, especially chemical sunscreen products with high SPF values, and are therefore more likely to cause skin allergies. Therefore, it is best to use chemical sunscreen products after lotion, as the lotion plays an isolation role here.
3. Differences in mechanisms of protection against UVA and UVB
Some of the chemical sunscreens added to chemical sunscreens only protect against UVA, and some only protect against UVB, so a variety of different sunscreens must be added, and a relatively high concentration is required to protect against both UVA and UVB; and The main physical sunscreen agent in physical sunscreen products can protect against both UVA and UVB.
Therefore, in general, physical sunscreen is safer and more gentle, and physical sunscreen products with the same index are more stable than chemical sunscreen products. In the physical sunscreen category, physical sunscreen liquid has the seven major advantages of "light, translucent, white, bright, protective, protective and thin". It integrates sun protection and isolation, comprehensive protection, light texture, refreshing and non-sticky, waterproof and sweat-proof, and non-toxic. Afraid of the sun, it will not increase the burden on the skin. SPF30 PA++ high-power sun protection, full-band protection, has the effect of protecting UVA and UVB, and can block all kinds of ultraviolet rays. It can also effectively resist skin damage caused by air pollution, electronic screen pollution and smog.
2. Advantages and disadvantages of physical sunscreen and chemical sunscreen
Chemical sunscreen:
It absorbs ultraviolet rays and then releases them in a lower energy form to avoid direct damage from ultraviolet rays.
Advantages of chemical sunscreen: Generally, the texture is relatively refreshing, and the skin does not feel heavy after application.
Disadvantages of chemical sunscreen: It needs to be reapplied regularly, otherwise the UV rays will be absorbed to a certain extent and the sunscreen effect will be weak, and the sunscreen contained in it will cause certain damage to the skin.
Physical sunscreen:
As the name suggests, it uses the principles of physics. The atomic particles of this sunscreen are flake-shaped. When spread on the face, they act like a mirror, reflecting sunlight to achieve the purpose of sun protection, which is different from chemical sunscreen.
Advantages: It can reflect ultraviolet rays for a long time. As long as you don't sweat or wipe it, you can maintain the sun protection effect. Especially for those female friends who are allergic to chemical sunscreen, physical sunscreen is also a good choice.
Disadvantages: Physical sunscreen is white in color and also greasy. The existing physical sunscreens are more stringent and will not be whiter or greasy than the physical sunscreens of the past, and also increase the cost. The price is also relatively not cheap. Physical sunscreens in Australia are relatively strict and will not appear white or greasy, nor will they easily clog pores.
3. Does physical sunscreen require makeup removal?
In fact, physical sunscreen also needs to be removed. Although physical sunscreen contains fewer chemical ingredients, it will still cause some minor damage to the skin. Therefore, if you choose to remove makeup, you can avoid the situation that causes damage. In fact, it can promote the improvement effect on the skin. In addition, general physical sunscreen will have a certain waterproof and sweat-proof effect, so it is difficult to completely clean it using ordinary methods, especially some facial cleansers have relatively poor cleaning effects, so we still choose to use makeup remover to improve it. The effect is obvious. Finally, the current sunscreen is relatively delicate, which means that after use, it is likely to cause clogging of pores, and in severe cases, it may even cause acne in the pores. Therefore, it is still necessary to remove makeup appropriately to avoid damaging the skin. Appear.
4. Misunderstandings about the use of physical sunscreen
1. Sunscreen is not effective just by applying it.
Under normal circumstances, sunscreen takes a certain amount of time to take effect, that is, it needs to form a film on the skin to promote sun protection. Many friends use sunscreen when they feel uncomfortable on the skin. In fact, it is generally recommended to apply 20-30 days in advance. Use it for minutes, so as to promote the formation of a protective film on the surface of the skin, so it can have the proper protective effect on the skin and promote better sun protection for the skin.
2. Sunscreen needs to be reapplied appropriately
The time that physical sunscreen can take effect is limited. In particular, sunscreen is easily affected by sweat and other conditions. It may fall off and have no obvious effect. Generally, physical sunscreen needs to be replenished in time. Apply, so that the effect of sunscreen on the skin can be better exerted. Especially in summer, it needs to be reapplied in about 2-3 hours. In winter and other seasons when the sun is not very strong, you can apply it appropriately according to your skin condition. The best effect is to apply it properly every 4-5 hours.