Dr. John Ashworth, a British dermatologist, asserts: “A lot of people think it’s okay to get a little sunburned.
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To understand how long the cream will last, you need to clarify some of the points below!
The prolonged greenhouse effect causes the ozone layer to thin, and in some places it is punctured (the ozone layer acts like an umbrella, blocking most ultraviolet rays from reaching the earth).
Currently, sunscreen is divided into two types:
Sunblock (Physical sun protection)
Advantages: This type of sunscreen has the function of forming an `invisible` layer that protects the majority of the skin from harmful UV rays and can be maintained for a long time.
Disadvantages: Sunblock often leaves traces when applied to the skin so it can cause greasiness.
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Sunscreen (Physical sun protection)
Advantages: Acts as a filter, has the function of absorbing UV rays.
Disadvantage: Takes time waiting for the cream to absorb into the skin.
The secret to being healthy and beautiful
Should I use sunscreen before or after lotion?
Based on the above characteristics, you can choose the type of cream for each different activity.
After understanding the properties of sunscreens on the market, ELLE will answer the question: How long does sunscreen last?
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Each sunscreen product always has a certain SPF parameter.
On the product there is a circle with the word UVA and at least three stars as prescribed by the EU. If there are 4 or 5 stars, it will work even better.
On the packaging is the PA index (abbreviation for Protection Factor of UVA).
Two numbers appear on the product.
If the cream packaging says `Full Spectrum` or `Broad Spectrum`, you can rest assured because the cream protects against both types of UV rays.
How to calculate safe sun protection time for skin
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The SPF index on the cream shell represents the level of sun protection.
For example: You buy sunscreen with SPF 30. You will take 30 x 10 (or 15 minutes) = 300 (or 450 minutes), which is equivalent to 5 hours or a maximum of 7.5 hours.
In addition, another method is applied to girls who are often exposed to the sun.
For example: When going out in the sun, how long does it take for your skin to start burning and turning red? That is the time your skin becomes irritated in the sun.
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Despite the formula, sun protection is actually governed by many factors.
See more:
Mistakes when using sunscreen cause dull skin
5 must-have full-body sunscreens this summer