PA Rating
PA Rating — a labeling system, common in Asian sunscreens, that indicates the level of UVA protection using plus signs from PA+ to PA++++. It is based on the persistent pigment darkening method and complements SPF, which mainly reflects UVB protection.
Key points
- The PA rating measures UVA protection and is derived from the PPD (persistent pigment darkening) test method.
- More plus signs indicate greater UVA protection, ranging from PA+ for some protection up to PA++++ for the highest level.
- The PA system is widely used in Japan, Korea, and other markets, while other regions may use different UVA labeling such as a circled UVA seal.
- PA rating works alongside SPF, together signaling protection across both UVA and UVB wavelengths.
Frequently asked
What does PA++++ mean?
It indicates the highest level of UVA protection on the PA scale, based on the persistent pigment darkening test, and pairs with SPF to convey overall coverage.
How is PA rating different from SPF?
SPF mainly measures protection against UVB rays that cause sunburn, while the PA rating specifically communicates the level of UVA protection.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
