Find out the SPF and PA ratings on sunscreen and the myths girls all make

1 Find out the sunscreen index

To know the ability of sunscreen to protect against UV rays, people rely on SPF and PA numbers.

SPF

SPF (short for Sun Protection Factor) is a measure of the ability to resist UVB rays used in sunscreens, with the lowest being 15 and the highest being 100. According to international norms, 1 SPF is capable of Protect and limit the harmful effects of UV rays on the skin in about 10 minutes .

For example: Sunscreen with SPF 15 will protect the stomach within 150 minutes, SPF 50 will be about 500 minutes.

In addition, the SPF number also shows the percentage of ability to block harmful effects from UV rays. When placed in perfect conditions, a sunscreen with an SPF of 15 will block about 93.4% of UV damage, SPF 30 about 96.7%, and SPF 50 about 98%. However, this ratio is also relative in a certain period of time.

Chỉ số SPF

Index PA

PA (short for Protection Grade of UVA) is a measure of a sunscreen's ability to filter UVA rays , published by the Japan Cosmetics Association. Usually on the sunscreen package, the PA index is shown with the "+" sign , which is understood as follows:

  • PA + has UVA protection at 40 – 50%.
  • PA++ has better UVA protection, at the level of 60 – 70%, the time is about 4-6 hours.
  • PA+++ has good UVA protection, up to 90%, the time is about 8 – 12 hours.
  • PA++++ has very good UVA protection, over 95%, over 16 hours.

However, you may not see the PA rating on some sunscreens today. Instead, there are abbreviations such as: UVA-UVB, UVA/UVB or UVA1, UVA2. Besides, there are separate symbols of manufacturers, countries, …

For example, SPF 60-12 means SPF 60 and PA+++.

Chỉ số PA

2 Should I use a sunscreen with a high SPF/PA? How much SPF/PA is good?

Most people think that the higher the SPF/PA number, the better because the higher the ability to protect the skin against UV rays. However, this is not entirely accurate.

Using a sunscreen with a high SPF/PA, but not suitable for your skin , can cause allergic reactions and rashes. Besides, when using a type with a high SPF, it stays on the skin longer, easily causing clogged pores and damaging skin, quickly appearing signs of aging.

Normally, you should use SPF 30 – 60 sunscreen is just enough , but if you are someone with especially sensitive, inflamed or swollen skin, an SPF 15 – 30 sunscreen will avoid skin irritation, although However, the effectiveness of sunscreen is not high. With a very high SPF index of 60-100, you should only use it in areas of the skin that need to be protected from the sun, areas that are being treated for melasma or are allergic to sunlight.

For PA index, you should prioritize sunscreens with PA+++ or PA++ to provide better protection and longer protection time.

PA và SPF bao nhiêu là tốt

3 Myths about SPF/PA

Using a high SPF/PA sunscreen does not need to be reapplied

The higher the SPF/PA sunscreen, the more effective it is against UV rays, but it's only relative and depends on the time of using the cream. Therefore, on average, after 2-3 hours , you need to reapply sunscreen to best protect your skin.

Small dosage still ensures quality

Typically, you only use 1/2 to 1/4 of the required amount of sunscreen. For effective sun protection, you need to apply the FDA -recommended amount of 2 mg/cm2 of skin surface .

Chỉ số PA và khả năng bảo vệ

SPF is only needed when it's sunny

Even on cloudy days, UV rays can still damage your skin. Therefore, you should use sunscreen every day , not just for sunny days, with an SPF of 30 or higher.

If you have used sunscreen, you are not afraid of the sun

Sunscreen only helps limit the harmful effects of UV rays and is only relative. Therefore, you need to minimize your skin's direct exposure to the sun and wear more jackets , sundresses, masks, etc. to better protect yourself.

Above is the sharing of SPF and PA numbers on sunscreen. Don't forget to leave a comment if you have any questions that need to be answered!

The post https://meo.tips/health-and-life/find-out-the-spf-and-pa-ratings-on-sunscreen-and-the-myths-girls-all-make/ appeared first on Meo.tips.

View more from Meo.tips:

The West has a strange fruit with a bad skin but an unforgettable taste
How many clothes should be put in the washing machine? The easiest way to estimate the volume of dry clothes
How to make a unique and impressive paper flower as a gift on March 8
Good tips to use betel leaves to treat underarm odor, both cheap and effective
7 reusable household items that we often throw away
9 ways to dry sports shoes quickly and effectively
Things to know about energy-saving energy labels when shopping
Getting caught in the rain should not be underestimated
Why should you soak your feet in hot water?
Pocket 7 tips to collect debt gracefully, effectively, smartly and skillfully during Tet holiday
The CEO of Levi's hasn't washed jeans in 10 years, so how often does he wash jeans?
Soak anise with white vinegar, bring many unexpected uses
How to make some homemade hair masks for dry, tangled hair
Treat acne quickly with ingredients available at home
Should I turn on a large or small fan to save electricity?
Meaning of symbols on clothing labels
How to effectively repel flies, ants, cockroaches and some indoor insects
Treat long-standing dark circles with familiar vegetables at home
Poisonous foods you should know
3 ways to make simple, easy-to-follow 3D handmade cards for March 8

Nhận xét

Đăng nhận xét

Bài đăng phổ biến từ blog này

Tips and Tricks for Making Familiar Cakes – Even the Clumsiest Person Can Make It Delicious

Hình ảnh
During the long days off due to the pandemic, many housewives have been showcasing their baking skills. However, when baking at home, you often encounter “unfortunate and frustrating” situations regarding the process as well as how to make the cakes more delicious and appealing. Sometimes, it’s just the little mistakes that can make a batch of cakes turn out not so tasty. Keep these handy baking tips in mind to always achieve delicious and beautiful results, the easy way! 1. Making Dried Grape Sponge Cake To make a delicious dried grape sponge cake, you will need the following ingredients: – 200g all-purpose flour – 150g sugar – 3 large eggs – 100ml milk – 100ml vegetable oil – 1 tsp baking powder – 1/2 tsp vanilla extract – 100g dried grapes Instructions: 1. Preheat your oven to 180°C (350°F). Grease and flour a cake pan. 2. In a large mixing bowl, combine the flour, sugar, and baking powder. Mix well. 3. ...
Đọc thêm

11 Simple Tips to Clean and Shine Your Old Shoes Like New and Make them Fit Perfectly with Your Feet

Hình ảnh
After a long period of use, shoes often become old and scratched. Repairing them can be time-consuming and expensive. The following 11 clever tips will help you avoid the hassle of going to a shoe repair shop and still be able to transform your old shoes into new ones in no time. 1. Polish leather shoes with banana peels Banana peels can help make leather shoes shiny like new. First, rub the shoes with the banana peel, then wipe them clean with a paper towel. 2. Clean shoes with stain remover The edges of shoes are often dirty from movement. There is a quick stain removal tip that does not require washing, and that is to use stain remover to remove mud and dirt stains. In no time, your shoes will be as white as new. 3. Use a nail file to clean suede shoes If your suede shoes are dirty and you don’t know what to do, there is a simple solution, use a nail file to gently scrub the dirty areas, and the stains will disappear completely. Remember to be gentle, or your ...
Đọc thêm

Level up your sticky rice game with this simple trick: the secret to perfectly cooked, fragrant, and fluffy sticky rice.

Hình ảnh
Xoi is an indispensable dish on festive days, family parties. If you want to have delicious, soft, and evenly cooked xoi, do not miss the secret below! Choose good glutinous rice According to the experience from the past, good glutinous rice determines 70% of the deliciousness of xoi. Sticky rice with yellow flowers when steamed, has less breakage, even grains, beautiful shine, and fragrant softness. In addition, there are also Tú Lệ, nương Điện Biên, gooseberry, and velvet sticky rice, which are also preferred because of their natural fragrance and softness. The way to choose good glutinous rice is to have a milky white color, even and round grains, shiny, and smells like fresh rice. Soak the rice Because xoi is cooked with steam, it is necessary to soak the rice for 6 to 8 hours depending on each type to help the glutinous rice “absorb” water, and when cooked, it will expand to be soft and aromatic. When soaking, add a pinch of salt to make the xoi flavorful and to eli...
Đọc thêm