Thursday, 13 July 2017

How Does a Sunscreen Work?

Sunscreen is the most common sun defense product that people use. They are usually formulated as lotions or gels. They’re also available as sprays and waxes. Sunscreens are essentially made up of chemicals—either organic or inorganic. But how do they work?
The purpose of sunscreen is to redirect UV (ultra violet) rays so that they don’t fall on your skin. They either reflect or absorb them. In turn, this protects your skin underneath. Here’s how they work.
Inorganic chemicals
Certain inorganic chemicals have properties that act as a physical sunblock. These are compounds like zinc oxide and titanium dioxide. They act like paint reflectors. They reflect UV rays falling on your skin and form a barrier between your skin and the rays.
During the 1980s and 90s, these inorganic particles were relatively larger, so people wearing sunscreen would have white patches over the areas they had applied sunscreen. In recent times, the formulation has improved. Now, the particles aren’t visible anymore. They look and feel like any ordinary moisturizing cream.
Organic chemicals
In addition to inorganic chemicals, sunscreens often contain organic chemicals as well. These include avobenzone or oxybenzone. These work in a manner opposite to inorganic chemicals. They absorb the UV rays that fall on your skin. The chemical bonds in these compounds absorb the UV radiation, which is slowly released as heat.
The idea of sunscreen is to either reflect or absorb the radiation and not let it come in contact with skin.
Ultraviolet radiation
The part of sunlight that sunscreen filters or blocks is ultra violet radiation. This UV radiation can be classified into three, based on its wavelength.
       UV-A - leads to skin cancer and premature skin aging
       UV-B - responsible for tanning  and sunburn
       UV-C - doesn’t affect skin
SPF
SPF stands for Sun Protection Factor. You’d find this number on all sunscreen products. It mentions the number of hours that it’d protect you from the sun before damage begins.

For all round protection, you need UVA and UVB sunscreen. This is known as a broad spectrum lotion. When buying sunscreen, make sure to look for a broad spectrum lotion like Kaya Sweat Proof Sunscreen SPF30+. Their products are dermatologically tested and formulated by experts. Know more about their safety and efficacy from the Kaya feedback on the Internet.

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