5 Key Knowledge about Skin Care Sunscreen and SPF
Sunscreen is one of key basic cosmetics for your skin care. Which will protect your skin from ultraviolet ray. ^^
Sunscreen is a cream that is applied to prevent skin burns or burning by blocking ultraviolet rays. Ultraviolet A (UV A) is a ray that causes skin cancer, and ultraviolet B (UV B) is a factor that causes burns.
Therefore, you should use sunscreen that blocks UVA and UVB during outdoor activities.
1. What is SPF sunscreen?
SPF, or Sun Protection Factor, is a measure of how well a sunscreen protects skin from UVB rays, which is the kind of radiation that causes sunburn, damages skin, and can contribute to skin cancer.
It blocks UVB, which causes spots, freckles, and erythema, and is used for everyday life. SPF 15 or higher is sufficient for everyday use.
If your skin burns normally after 10 minutes in the sun, you can apply SPF 15 sunscreen and stay in the sun without burning for about 150 minutes (15 times longer).
This is a rough estimate based on skin type, intensity of sunlight and amount of sunscreen used.
SPF is actually a means of protection from UVB dosage and does not help determine the duration of exposure.
The number after SPF indicates the sun block time. Put another way, if your unprotected skin would take ten minutes to show signs of burning, then properly applying SPF 30 sunscreen would slow the rate of burning to the point where it would take 30 times longer, or 300 minutes in total. SPF 15 would take 150 minutes, while SPF 50, 500 minutes.
SPF stands for sun protection factor. It’s the measure of how much UV gets through the screen. The higher the number, the less UV passes through.
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SPF 15 blocks 93% of UVB rays
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SPF 30 blocks 97% of UVB ray
- SPF 50 blocks 98% of UVB rays
2. What is PA?
SPF indicates the level of protection from UVB rays while PA indicates the level of protection from UVA rays
PA simply means Protection Grade of UVA rays, which is used to measure the SPF of a sunscreen. This Japanese measurement ranking which is now widely used, is based on the Persistent Pigment Darkening (PPD) reaction reading at 2-4 hours of sun exposure. Protective grade of sunscreen is often leveled as PA+, PA++, PA+++ with the more plus sign the more protection from UVA rays.
It blocks UVA, which causes pigmentation and wrinkle aging
PA+++ > PA++ > PA+
PA+ is sufficient for everyday use, and if you are exposed to leisure activities or intense sunlight for a long time, PA+++ is recommended.
PA+ means the sunscreen can provide UVA protection with factor of Persistent Pigment Darkening (PPD) between two to four. It can provide the protection of medium UV radiation.
Sunscreen labeled with PA++ can provide moderate protection against UVA rays with a factor of PPD between four and eight. It is ideal for normal skin individual exposed to medium UV radiation.
PA+++ is designed for normal skin that expose to very strong UV radiation. It provides good UVA protection with a factor of PPD of more than 8. It is the highest grade of UVA protection currently available.
Although many products in the market are labeled as “broad-spectrum” they do not give effective protection against UVA rays. UVA protection is better achieved by products containing zinc oxide. UVB just causes sunburn while UVA causes permanent aging of the skin and even increase risk of skin cancer. So it is important to strictly use sunscreen that protects from both UVA and UVB radiation.
3. What is Effect of Sunscreen
- Anti-Wrinkle effect : To prevent skin aging, sunscreen is better than anti-wrinkle cream. Studies show that sunscreen not only slows skin aging but also reverses skin aging
- Prevention of pigmentation such as spots and blemishes
- Prevention of skin cancer-related diseases
- Healthy skin
4. The best way to choose right sunscreen for you
Summer is in full swing. And while you should use sunscreen every day of the year, it’s even more important during summertime – when the days are longer, the sun is stronger, and it’s easier to spend more time outdoors. When choosing sunscreen, be sure to read the label before you buy
- Choose a sunscreen with “broad spectrum” protection. Sunscreens with this label protect against both UVA and UVB rays. All sunscreen products protect against UVB rays, which are the main cause of sunburn and skin cancers. But UVA rays also contribute to skin cancer and premature aging. Only products that pass a certain test can be labeled “broad spectrum.” Products that aren’t broad spectrum must carry a warning that they only protect against sunburn, not skin cancer or skin aging.
- When choosing a sunscreen for your skin, It is good to check the ingredients and make sure there is no irritation to the skin rather than just looking at high SFP or PA. It is said that various chemical ingredients are added to increase the SPF. Therefore, it is not always good to have a high one. Dermatologists recommend using an SPF of at least 30.
- Dermatologists also recommend that you look for the words "water resistant.” This tells you that the sunscreen will stay on wet or sweaty skin for a while before you need to reapply. Water resistance lasts either 40 or 80 minutes. Not all sunscreens offer water resistance.
5. How to apply Sunscreen
Apply at the end of basic makeup.
For example, “Toner->eye cream->face lotion or face cream->sunscreen “
It is not good to apply thick from the beginning. If applied too much, it is likely to be exposed to ultraviolet light due to being outward or pushed back. Apply a small amount evenly over the entire face or body and spread it.
After spreading it evenly, if you tap it to finish it, it will adhere better to the skin and the blocking effect will be better.
Apply with care on the forehead, nose, and cheekbones, and apply carefully without missing the eyes.
When applying sunscreen, it is easy to miss the edge of the face. It’s good to make a habit of applying it from the outside of your face in order to apply it meticulously in every corner.
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