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Talking About Sunscreen: On Water Activities, SPF, and Skin Protection

Interviewer (Toby Zhen): Today, we have the sudden pleasure of welcoming skincare engineer (Chris Lin) to answer some questions about sunscreen. Hello, Mr. Lin, thank you for your impromptu presence.

Lin: Hello, I’m delighted to be here discussing skincare topics with everyone.

Zhen: Thank you very much for joining us. First, let’s talk about the differences between waterproof sunscreen and regular sunscreen. What are the main distinctions between them?

Lin: The main differences between waterproof sunscreen and regular sunscreen lie in their formulation and performance characteristics. Waterproof sunscreen typically contains special ingredients such as silicones or polymers that can form a thin film on the skin, helping to resist water and sweat. This makes waterproof sunscreen effective even after swimming, diving, or engaging in vigorous activities. In contrast, regular sunscreen places more emphasis on UV radiation protection, containing UV absorbers in its formulation to provide broad-spectrum UV protection, but it usually lacks waterproof properties.

Zhen: Very clear explanation, thank you. So, how is the waterproofing performance of waterproof sunscreen indicated?

Lin: The waterproofing performance of waterproof sunscreen is usually indicated on the product packaging. You will see different waterproof levels, such as “40 minutes water-resistant” or “80 minutes water-resistant.” This indicates how long the product’s protective effect will last when exposed to water or sweat. However, it’s worth noting that even with waterproof sunscreen, it’s recommended to apply it before activities and reapply it regularly after exposure to water or sweat to ensure continued protection.

Zhen: Very practical advice. When it comes to sunscreen, there’s another term that people often hear, and that’s the “Sun Protection Factor” or SPF. Mr. Lin, could you explain to us what SPF is?

Lin: Certainly. SPF, or Sun Protection Factor, is a measure of sunscreen’s ability to protect against UVB (ultraviolet B) radiation. It tells us how long the skin can withstand sun exposure without getting sunburned when using the product correctly. For example, if you’re using SPF 30 sunscreen, it means you can stay in the sun for approximately 30 minutes without getting sunburned, provided you’ve applied a sufficient amount of sunscreen.

Zhen: Thank you very much for your explanation; it makes it easier for us to understand the concept of SPF. That concludes our impromptu interview today, and we hope it has been helpful to our listeners.

Created by Liru Skincare Team 2023.09.13.

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