SPF and PA: What They Are and How to Choose the Right Sunscreen for Your Skin
Kevin @Amabelle
Last updated: 5 Aug 2025
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What Are SPF and PA?
Daily sun exposure does more than darken your skinit damages skin cells, causes wrinkles, dark spots, and even increases the risk of skin cancer. Thats why wearing sunscreen is an essential part of any skincare routine.
Lets dive into the differences between SPF and PA and how to pick the right combination for your lifestyle and skin type.
What Is SPF?
SPF (Sun Protection Factor) measures how well sunscreen protects your skin from UVB rays, which are responsible for sunburn, redness, peeling, and play a major role in skin cancer.
Heres a quick breakdown:
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SPF 15 filters about 93% of UVB rays
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SPF 30 filters about 97%
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SPF 50 filters about 98%
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SPF 50+ means protection higher than SPF 50
In Thailand, the maximum SPF value allowed on product labels is SPF 50+, as regulated by the Thai FDA (Food and Drug Administration).
Why cap it at SPF 50+?
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To avoid misleading claims: SPF 70 or SPF 100 may make consumers falsely believe theyre fully protected or dont need to reapply.
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To maintain marketing and labeling standards: Using "SPF 50+" ensures consistent communication and avoids exaggerated promises.
What Is PA?
PA (Protection Grade of UVA) indicates how well a sunscreen blocks UVA rays, which penetrate deeper into the skin and cause premature aging, wrinkles, dark spots, and long-term skin damage.
The PA system uses + symbols:
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PA+ = Low UVA protection
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PA++ = Moderate protection
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PA+++ = High protection
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PA++++ = Very high protection (ideal for strong sun or outdoor activity)
A good sunscreen should include both SPF and PA for full UV protection.
How to Choose Sunscreen That Suits You
Daily Activity |
Recommended SPF & PA |
Indoors / Office Work |
SPF 1530 / PA++ |
Outdoor Errands |
SPF 3050 / PA+++ |
Beach / Sports / Hiking |
SPF 50+ / PA++++ |
Based on Skin Type:
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Oily or acne-prone skin: Look for Oil-Free or Non-Comedogenic formulas
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Dry skin: Choose sunscreens with moisturizing ingredients
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Sensitive skin: Opt for Physical (Mineral) Sunscreens with no fragrance or irritants
Application Tips:
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Apply 1530 minutes before sun exposure
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Reapply every 2 hours, especially after swimming or sweating
Summary: Why SPF and PA Matter
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SPF protects your skin from UVB rays that cause burning and increase cancer risk.
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PA protects from UVA rays that cause aging and deep skin damage.
Choosing a sunscreen with the right SPF and PA levelsand reapplying regularlywill help you keep your skin healthy and youthful in the long run.
Starting Your Own Soap Brand
If you are considering creating your own brand or need product samples about sun screen product, feel Free to consult with our team for free guidance. We have a dedicated R&D team to help you from start to finish. Our factory meets GHPs and FDA standards, and we offer production runs starting from just 100 pieces!
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