Knowledge expansion on UVA and UVB, physical sunscreen and chemical sunscreen
What are UVA and UVB?
UVA (Ultraviolet A) and UVB (Ultraviolet B) are the two main types of ultraviolet radiation from the sun, each with distinct effects on the skin.
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UVA: UVA has longer wavelengths and accounts for 95% of UV radiation. It penetrates the skin’s outer layer, reaching the dermis, causing skin aging such as wrinkles, sagging, and long-term exposure-related skin cancer. UVA radiation is present all day long, even on cloudy days or when passing through windows.
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UVB: UVB has shorter wavelengths and primarily affects the surface of the skin, directly causing sunburn. UVB radiation varies in intensity depending on the season, time of day, and geographic location, with the strongest radiation occurring in summer and midday. UVB radiation causes redness, burning, and significantly increases the risk of skin cancer.
The Role of Titanium Dioxide and Zinc Oxide
Titanium Dioxide and Zinc Oxide are the two main physical sunscreen ingredients that provide broad-spectrum protection against both UVA and UVB rays.
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Titanium Dioxide: Titanium Dioxide is a broad-spectrum sunscreen ingredient effective at blocking a portion of UVA and UVB rays. It works by reflecting UV rays, preventing skin damage. It is particularly suitable for sensitive skin and forms a physical barrier on the skin’s surface.
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Zinc Oxide: Zinc Oxide reflects both UVA and UVB rays and also has anti-inflammatory and soothing properties. It helps alleviate discomfort from sun exposure, making it ideal for people who spend prolonged time in the sun.
Chemical Sunscreen Ingredients
In addition to physical sunscreen ingredients, chemical sunscreen ingredients also play a crucial role in protecting the skin from UV damage. Chemical sunscreens absorb UV rays and convert them into heat, reducing the risk of skin damage.
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Common Chemical Sunscreen Ingredients include Avobenzone, Octocrylene, Octinoxate, and Oxybenzone. These ingredients effectively absorb and convert UV rays to protect the skin from UVA and UVB damage.
Chemical sunscreens are usually lighter than physical sunscreens, making them ideal for consumers who prefer a fresh feel. However, they need time to take effect on the skin and may cause irritation for some sensitive skin types.
Physical Sunscreen vs. Chemical Sunscreen
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Physical Sunscreen: Physical sunscreens (such as Titanium Dioxide and Zinc Oxide) form a barrier on the skin’s surface, reflecting or scattering UV rays, preventing them from penetrating deep into the skin. These ingredients are not absorbed by the skin, take effect immediately after application, and provide long-lasting protection, making them ideal for sensitive skin.
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Chemical Sunscreen: Chemical sunscreens work by absorbing UV rays and converting them into heat, reducing the damage caused by UV radiation. Chemical sunscreens typically take time to become effective and may cause discomfort for people with sensitive skin.
Conclusion
Titanium Dioxide and Zinc Oxide, as physical sunscreen ingredients, provide broad-spectrum protection against UVA and UVB rays, forming an effective physical barrier on the skin. These ingredients are suitable for daily use and provide reliable protection for outdoor activities and intense sun exposure. On the other hand, chemical sunscreen ingredients absorb UV rays and convert them into heat, offering a different set of benefits. Both types of sunscreens have their advantages. We offer custom sunscreen solutions for brand owners, helping you create high-performance sunscreen products that meet market demands.