What Are UV Rays?
Ultraviolet (UV) rays are "beams" from the sun that are invisible to humans.
UV rays, which cause adverse effects on our skin and eyes, are divided into three different types according to the wavelengths: UVA, UVB and UVC.
A. UVA, which accounts for the great majority (over 95%) of the UV radiation that reaches the Earth's surface
Having a longer wavelength, UVA penetrates through window glass and clouds and reaches the deeper layers of skin. It is the type of UV radiation that gradually affects the skin in daily life.
B. UVB, which is small in amount but has a powerful impact on the skin
UVB only accounts for about 5% of the UV radiation that reaches the Earth's surface, but it is over 1,000 times more damaging than UVA in terms of producing red sunburns. Although the amount is less, this type of UV radiation has a powerful impact on the skin.
C. UVC, which is even more dangerous but does not reach the Earth's surface
UVC is extremely dangerous, even more damaging to the skin than UVB. However, it does not reach the Earth's surface thanks to the ozone layer which blocks this type of UV radiation.
How to Select Sunscreens
(based on SPF and PA ratings)
Pay attention to PA for protection against UVA!
The PA rating of a sunscreen indicates the level of protection against UVA with the number of plus (+) signs.
It is rated on a scale of one to four, and the greater the number of plus signs, the better the sunscreen protection.
Pay attention to SPF for protection against UVB!
The SPF value of a sunscreen indicates the level of protection against red sunburns.
A sunscreen with an SPF of about 50 is recommended for outdoor leisure activities, for example on the beach.
Mechanism of Sunscreens
Sunscreens contain ingredients that absorb UV rays to prevent them from reaching the inner layers of skin and powder ingredients that scatter UV rays to prevent them from reaching skin.
When you apply a sunscreen to your skin, it will form a thin film over the skin to stop UV rays from reaching the skin directly. These "ingredients that prevent UV rays from reaching skin" are classified into the following two types:
UV scattering agent:
Reflects away UV rays to prevent them from reaching skin
UV absorbing agent:
Absorbs UV rays, converts them into heat, and releases it
What is ADVAN, a technology adopted by ALLIE?
Blocking UV rays & creating a translucent finish
<ADVAN>, adopted by ALLIE, is a UV-blocking technology that achieves "high clarity" using a plate-like UV scattering agent.
- Blocks UVA, long exposure to which will cause damage to skin, such as a reduction in firmness.
- Fits skin thinly and evenly to leave it fine-textured and smooth.
- Does not look unnaturally white at the same time.