What is a Good Sunscreen?

What kind of UV rays exist?

The sunlight, which hits the earth’s surface, consists of 10% UV light, which is subdivided into:

The sunlight, which hits the earth’s surface, consists of 10% UV light, which is subdivided into:

  • 9.5% UV-A radiation (320 to 400 nm) : Is harmful to the skin as it penetrates the skin deeply.
    ☀ Damages the DNA of skin cells in sunburn and promotes skin cancer. In addition, the UV-A radiation damages the collagen of the dermis, which leads to a loss of the elasticity of the skin. Its also responsible for the tanning of the skin, but also for sun-induced skin aging such as unwanted pigment spots and increased wrinkling.
  • 0.5% UV-B radiation (290 to 320 nm): Higher energetic radiation, but much less harmful to the skin as it penetrates only superficially the the epidermis.
    👉Activates vitamin D production, but also leads to sunburn and skin redness and the death of individual skin cells.

UV-A radiation penetrates much deeper into the skin than UV-B radiation. With sun cream a large part of the UV radiation is reflected on the skin. (Source)

The 5 most Important Facts about Sunscreen

1. Sun Protection Factor

The sun protection factor refers only to the protection against UV-B radiation, which can lead to sunburn. Protection against the far more harmful UV-A radiation, which penetrates deep into the dermis of the skin and can lead to DNA damage, isn’t considered.


2. Pay attention to additional UV-A filter

When choosing the sun cream, always pay attention to an additional UV-A filter. Since 2007, the UV-A filter in the EU has been marked in the form of a round circle, otherwise there is no protection against the much more harmful UV-A radiation. The ratio between UV-A and UV-B protection is always at least 1:3 according to European law. With a sun protection factor of 30, the UV-A protection is only 10.

Source

3. What Types of Sunscreens are there?

Type 1 – organic filters: e.g. cinnamic acid, the UV radiation is converted into heat energy.
Type 2 – mineral white pigments: e.g. titanium dioxide or zinc dioxide, which reflect the UV radiation.

➡ The higher the sun protection factor, the more mineral filters the sunscreen contains.


4. There are No Sun Blockers

Remember that there are no sun blockers because no sun cream has been invented that can 100% block UV-B radiation.


5. How Long can I Stay in the Sun until I get Sunburned?

Self-protection time of the skin = time which elapses until a sunburn develops without the use of sunscreens. The self-protection time depends on the skin type. Since there are six different skin types, there are correspondingly six different self-protection times:

Skin type 1: approx. 10 min
Skin type 2: 10 to 20 min
Skin type 3: 20 to 30 min
Skin type 4: 30 to 45 min
Skin type 5: 60 min
Skin type 6: approx. 90 min

SPF = Sun Protection Factor The self-protection time of your skin, which can vary greatly from person to person, is multiplied by the SPF. This leads to your personal time during which you are protected from sunburn. Suppose you use sunscreen with SPF 30 and your skin type is 2:

30 (SPF) x 20 min (skin’s own protection time) = 600 min = 10 hours

➡ In this case, the skin would be protected from sunburn for 10 hours. A sun cream with a SPF of 30 is therefore sufficient for normal everyday life.

You are only protected against the more harmful UV-A radiation for a third of the time, about 3 hours and 20 minutes.


Where can I Buy a Good Sunscreen ? 🛒

👉 La Roche-Posay Anthelios Ultra-Light Mineral Sunscreen SPF 50 Waterproof sun cream for the face with sun protection 50+.

👉 La Roche Posay Anthelios XL LSF 50+ Getöntes Gesichtsfluid Deutsche Version Tinted waterproof sun cream for the face with sun protection 50+.

ANTHELIOS from La Roche Posay

The sun protection most frequently recommended by European dermatologists.

Anthelios stands for highest UV protection for sensitive or sun allergic skin. Ultra-minimalistic formulas limited to as few ingredients as possible offer optimum compatibility and tailor-made textures.

for all skin types and strains.

Source

Sources
5 Dinge, die man über den Lichtschutzfaktor in Sonnencreme wissen muss – Spektrum.de
Sunscreen – Wikipedia
Sunburn – Wikipedia