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 When it comes to sunscreens in cosmetics, very often we hear about the physical or chemical formulas. What does that mean, and what physical filters are different from the chemical?
Chemical.
Chemical blocks (their ingredients - such as oxybenzone and avobenzone) protect the skin at the cellular level, they interact with cells of the skin. Therefore, creams are chemical units should be applied to the skin (a moisturizer) and wait 30 minutes before you go outside.
If you have sensitive skin, it blocks the chemical can cause irritation, and then from these funds should be abandoned.
The advantage of chemical units that they leave no white residue on the skin.
Physical.
As the physical blocks can be identified ingredients such as titanium dioxide and zinc oxide. Physical filters work as a physical shield on the skin's surface, which absorbs the sun's rays. They form an invisible film on the skin surface. That is why these tools work best when applied on top of the daily caring means.
Physical filters are generally considered more effective in blocking UVA and UVB rays. Another advantage: the means with physical filters have a longer shelf life. However, they are not as resistant to water and sweat, as a means of chemical filters, and is updated frequently.
Whitish bloom really happens, but the current generation of physical filters available in the form of micronized titanium dioxide (or zinc oxide), so that leaves almost no trace.
It is important to:
Most sunscreen products in the market are composed of both physical and chemical filters. However, if you have sensitive skin, you better have a means only physical filter. More advice: physical filters can be applied over a chemical, it will give extra protection.
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