We often see the terms SPF and PA on our sunscreens and are taught that the higher the SPF the better it is. Likewise, the more + signs there are for PA, the better it is. But have you ever wondered why and how exactly do SPF and PA help us prevent premature aging?
You’re in luck today. This article will tell you all you need to know about SPF and PA++
It is known as Protection Grade of UV-A. This Japanese ranking system uses the plus (+) sign as a measurement. More + means better protection from UV-A.
In general, SPF correlates with PA. The higher the SPF, the higher the PA value.
Read more about what is UV-A and what are the effects it has on our skin.
It is known as Sun Protection Factor. The value attached to it is the effectiveness of protection against UV-B rays.
Read more about what is UV-B and what are the effects it has on our skin.
Let’s say, your bare skin takes about 1 minute to get burned, with an SPF 20 sunscreen, the protection will be increased by 20 times, thus increases the time taken to get burned to 20 minutes.
If you prefer your sunscreen texture to be less thick, you will want to choose a sunscreen with lower SPF as higher SPF sunscreens tend to be thicker. But if you really prefer something that is of high SPF and yet does not have feel so thick on your face, you may want to buy a water-based sunscreen.