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What is the difference between chemical and physical sunscreen?

16 March 2020 | By Leigh van den Berg

If you’re taking good care of your skin, you’ll be applying a sunscreen every time you step outside, but do you know which type you’re using? 

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“Physical sunscreens create a barrier on the skin that filter out UV rays, while chemical sunscreens absorb and scatter the sun's harsh UV rays,” says Liezel Smyrnios, the in-house skincare therapist trainer for Skin Renewal. Both have their pros and cons, but if you know more about them, you’ll be able to choose the type that suits you best. Let's look at the main differences between physical and chemical sunscreens.

Physical sunscreen

Because of their literal shield-like nature, physical sunscreens start working the moment they’re applied. Still, if you’re keen on exercising outdoors or in need of something particularly water-resistant, they might not be the best choice for you. “Physical sunscreens can rub off, sweat off and rinse off easily, so more frequent application is required,” says Smyrnios, adding that some formulations can leave your skin looking “chalky” if you don’t rub them in properly. 

The two most popular ingredients in physical sunscreen are titanium dioxide and zinc oxide. These active minerals are less likely to irritate sensitive skin, so they’re a good choice for babies, children and those suffering from inflammatory skin conditions like acne or eczema. 

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Chemical sunscreen 

Chemical sunscreens contain chemical UV-filters like oxybenzone and avobenzone. As they’re the most popular kind, you’ll find them in a huge array textures that range from feather-light and gel-like to creamy and hydrating. Also, unlike many physical sunscreens, they’re a lot more water-resistant and less likely to leave a white-ish cast on your skin. 

While you can find chemical sunscreens formulated for the sensitive sort, Smyrnios reckons very reactive skin might be better suited to a physical sunscreen. “Chemical sunscreen has an increased risk of irritation and stinging both on the parts of your body you apply it to, as well as skin and eyes.”

If you do choose to go with a chemical sunscreen, Smyrnios reminds us that it needs to penetrate your skin in order to work, so make sure you apply it at least 20 minutes before heading outdoors.

IMAGE CREDIT: 123rf.com 

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