General sunscreen for commuting, will the index of 21 be too high?

Fifteen is OK, too high is burdensome to the skin, shopping with thirty, and sunscreen needs to be reapplied for a few hours, because after a certain period of time, there is no sunscreen.

Yes, because the sun protection index of 21 is only the result of the test, and the thickness we usually apply is not up to the thickness of the test, and the daily effective time of sunscreen products is generally two or three hours, the so-called all-day sun protection is also a laboratory test result, and can not be fully used in daily life.

You chose a Japanese product, right?

Half an hour, just one + is enough, pa+, enough for you to be outdoors for 3 or 4 hours.

Sunscreen products usually have a SPF of up to SPF 120. The use of sunscreen products with too high index can easily cause skin quality to deteriorate, such as dryness and enlarged pores.

To be cautious about improving sun protection, you can achieve it by using sunscreen products for a time and frequency. When we are doing outdoor activities, it is generally recommended to use it again after an interval of 2 or 3 hours, so that the sun protection effect will be better. Sunscreen, gentle and caring type, makes your skin hydrated and shiny, and it is not greasy, and the sun protection is more effective.

Hello! Although SPF is an important indicator of sun protection, it does not mean that the higher the SPF value, the stronger the protection. The larger the SPF value, the worse its permeability, which will hinder the normal secretion and respiration of **.

SPF10 SPF15 sunscreen can be used for daily protection; If you engage in outdoor recreational activities such as swimming and playing ball, SPF20 is enough to resist UV damage without burdening your skin. Products with too high SPF will have a relatively greasy and heavy texture, which can easily clog pores and even breed acne and acne. In addition, some high-coefficient sunscreens that are chemical sunscreens are mostly converted into other substances after absorbing heat energy under long-wave ultraviolet irradiation, resulting in skin allergies.

It is best not to be too low or low in the sun protection index of about 30, too low to achieve the sun protection effect, too high will increase the burden on the skin.

But if you don't get exposed to the scorching sun, then too high a SPF will be a burden on you, because a high SPF will be greasy and heavy.

For general daily commuting, SPF25-30, PA1, and 2 plus are enough.

Hello, Know Me Cosmeceutical Skin Consultant is happy to help you.

SPF is the English abbreviation of Sun Protection Factor, which is the ability of sunscreen skin care products to protect against ultraviolet rays. The higher the SPF index, the greater the protection given to **. Different SPF values indicate different amounts of time for effective sun protection.

Specifically: SPF 15 = 15 * 10 = 150 minutes, SPF 20 = 20 * 10 = 200 minutes, and so on. However, sunscreens with a high SPF are heavier than those with a lower SPF, so be sure to pay attention to the cleanliness of your face.

The SPF value is the main thing that will be labeled on every bottle of sunscreen. The true meaning of SPF seems too formal to be understood. The scientific sun protection index refers to the ratio of the energy required to produce the smallest erythema on the ** coated with sunscreen protection and the energy required to produce the same degree of erythema on the ** without any protection, simply put, it is the multiple of the time to resist ultraviolet rays.

The higher the sun protection index, the better, but the higher the value of the sunscreen product, the longer the time to prevent yourself from sunburn and tanning, so as to have a stronger sunburn and tanning effect. However, the higher the value of sunscreen, the more chemicals are added to the sunscreen, the thicker the texture will be, and the breathability of the skin will deteriorate after application, and the burden will become heavier.

When choosing sunscreen products, many people will feel that the higher the sunscreen index, the better the effect of sunscreen, so it is necessary to choose products with a high sun protection index. But in fact, this approach is not right.

Is the higher the SPF, the better?

The higher the value of sunscreen products, the better, but the higher the value of sunscreen products, the longer the time to prevent sunburn and tanning, so the effect of sunburn and tanning will be stronger.

However, the higher the value of sunscreen, the more chemicals are added to the sunscreen, the thicker the texture will be, and the breathability of the skin will deteriorate after application, and the burden will become heavier. It can be seen that the higher or the better the value of sunscreen, you should choose the value of sunscreen suitable for your own use according to your personal needs and different occasions and environments.

Can sunscreen only be applied once per day?

Sunscreen products should not be applied only once a day, because sunscreen products are sunscreen-effective, so when outdoors, you need to reapply sunscreen products every 2-3 hours. And if you are indoors, you should also reapply sunscreen about twice a day.

In fact, when choosing sunscreen products, in addition to looking at the sunscreen index, you also need to choose sunscreen products that are suitable for you according to your own skin type.

Summary. SPF 15 provides sun protection for 5 hours.

SPF 25 provides sun protection for 8 hours.

SPF 30 for 10 hours of sun protection.

SPF 50 for hours of sun protection.

The SPF is calculated as follows: assuming that the intensity of ultraviolet rays does not change over time, a person without any sun protection measures will turn red after 20 minutes in the sun, and when he uses SPF15 sunscreen, it means that he can extend the time by 15 times, that is, after 300 minutes**, he will be reddened.

For example, if you don't wear sunscreen and your ** will turn a little reddish after 20 minutes in the sun, a SPF 15 product will protect you for up to 5 hours.

20 (minutes) x 10 (SPF) = 200 minutes (about 3 hours)

PA+++ means that it can delay the tanning time of the skin by about 8 times.

PA+ means it can delay the tanning time of the skin by 2-4 times, PA++ means it can delay the time of 4-8 times, and PA+++ means it can delay the time by more than 8 times.

How long can 19 times SPF protect against the sun?

SPF 15 provides sun protection for 5 hours. SPF 25 provides sun protection for 8 hours. SPF 30 for 10 hours of sun protection.

SPF 50 for hours of sun protection. The numerical calculation of the SPF is: assuming that the intensity of ultraviolet rays will not change early, if a person who does not have any sun protection measures will turn red after 20 minutes in the sun, when he uses SPF15 sunscreen, it means that he can extend the time by 15 times, that is, after 300 minutes**, he will be reddened.

For example, if you don't wear sunscreen and your ** will turn a little reddish after 20 minutes in the sun, a SPF 15 product will protect you for up to 5 hours. 20 (minutes) * 10 (SPF) = 200 minutes (about 3 hours) PA+++ means that it can delay the tanning time of the skin by about 8 times.

PA+ means that it can delay the tanning time of the skin by 2-4 times, PA++ can delay the time of repentance by 4-8 times, and PA+++ means that it can delay the time of skin tanning by more than 8 times.

19 times of the kiss is basically about 7 hours.

Which SPF of 50 or 30 is better?

It's definitely 50 good, the higher the better.

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