Common SPF and PA Differences Found in Sunscreen Products

Although both protect the skin from harmful ultraviolet (UV) rays, there is a difference between SPF and PA in sunscreen products. What are the differences? Check out the full explanation below.

Difference between SPF and PA in Sunscreen Products

Sunscreen or sunscreen usually includes the SPF and PA numbers on the packaging. Both have differences in protecting the skin from the dangers of UVA and UVB rays. Here are some of the differences between SPF and PA, including:

1. Protection

SPF stands for sun protection factor , is a measure of protection against ultraviolet B (UVB) rays used in sunscreens . UVB rays can cause sunburn and the risk of skin cancer.

While PA stands for protection grade of UVA , it is a measure that functions as skin protection from exposure to ultraviolet A (UVA) rays in sunscreens . UVA rays are known to cause skin aging.

2. Durability

SPF is usually accompanied by a number that indicates how long the skin's protection against UVB is.

The measure calculated in SPF is based on the amount of time UVB protection is applied when applying sunscreen to the skin. The higher the number, the higher the protection against UVB rays.

If you want to know the UVB protection time, try calculating the SPF number times 10. For example, a sunscreen with an SPF of 30 will protect your skin from UVB rays for 300 minutes.

Sunscreen SPF also has several measures that indicate its ability to block damage caused by UVB rays, including the following:

  • SPF 15 blocks 93.4% of UVB rays.
  • SPF 30 blocks 96.7% of UVB rays.
  • SPF 50 blocks 98% of UVB rays.
  • SPF 100 blocks 99% of UVB rays.

However, this ratio is also relative in a certain period of time.

Unlike SPF sunscreens which are marked with numbers, PA in sunscreens is marked with a plus symbol (+) which can be understood as follows:

  • PA+ blocks between 40-50% of UVA rays (a little).
  • PA++ blocks 60-70% of UVA rays (moderate).
  • PA+++ blocks up to 90% of UVA rays (high).
  • PA++++ blocks more than 95% of UVA rays (very high).

3. Side Effects

The sun protection time of a sunscreen with an SPF above 60 is not much better than that of an SPF 50. However, when using a high SPF type, it is likely to last longer on the skin.

However, the long-lasting SPF 50 easily causes clogged pores and skin damage, so that signs of skin aging quickly appear.

While PA in sunscreen also has an effect that causes skin discoloration.

Using sunscreens with high PA levels causes skin to tan or stay tan, a process called persistent pigment darkening (PPD).

For those of you who often do outdoor activities, knowing the difference between SPF and PA is something important. Hopefully this information is useful, Healthy Friends!

Leave a Reply

%d bloggers like this: