Sunscreen

Sunscreen refers to some methods to prevent or absorb ultraviolet rays for the purpose of preventing skin from being tanned and sunburned.Sunscreen products are divided into physical sunscreens and chemical sunscreens. Among them, the level of the sun protection index can reflect the UV protection ability of sunscreen products.

Depending on the wavelength, the UV is divided into three types:

  • UVA: The longest wavelength of ultraviolet light, which is not absorbed by the ozone layer at the top of the atmosphere. It can penetrate the dermis and penetrate deeper into the skin than UVB. It tans the skin and causes damage to lipids and collagen, causing photoaging of the skin and even skin cancer. Therefore, UVA not only stimulates the synthesis of pigments, but also makes the skin color “black”, which is the main cause of skin “aging” and fine lines.
  • UVB: medium-wave ultraviolet light, which can reach the dermis layer, causing skin burns, erythema, tanning and so on. However, most of the UVB is absorbed by the ozone layer and can be blocked by glass, umbrellas, clothes, and the like.
  • UVC: UVC is almost completely absorbed by the atmosphere, and in rare cases we will run into it.

The main difference between sunscreen and sunscreen is the physical properties. The general moisture content of the cream is about 60%. It looks thicker and creamy. The emulsion, with a water content of more than 70%, looks thin and has fluidity. Generally, the lotion is more refreshing than the cream because the water content is relatively high, but the formulator can still use different oily ingredients and thickeners to adjust the “greasy” degree of the cream.

Sunscreen is a cosmetic that protects against sunburn and sunburn by adding a sunscreen that blocks or absorbs UV rays. According to the principle of sun protection, sunscreen can be divided into physical sunscreen and chemical sunscreen.

Sunscreen is a cosmetic that protects against sunburn and sunburn by adding a sunscreen that blocks or absorbs UV rays. According to the principle of sun protection, sunscreen can be divided into physical sunscreen and chemical sunscreen.

Sunscreen lotion is a skin care product made by using the principle of sun protection to protect the skin from ultraviolet rays, thereby avoiding the production and accumulation of melanin. Apply to the skin to prevent the sun from coming into contact with the skin.

Sunscreen lotion is a skin care product made by using the principle of sun protection to protect the skin from ultraviolet rays, thereby avoiding the production and accumulation of melanin. Apply to the skin to prevent the sun from coming into contact with the skin.

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