How is SPF 18 sunscreen stronger than SPF 15?

Almost, the sunscreen lasts a little longer.

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

PF 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.

SPF 30 = 30 * 10 = 300 minutes.

SPF 50 = 50* 10 = 500 minutes.

PA stands for UVA (UVA is the effect of aging skin**) and is a Japanese sun protection index measure that measures the stability of persistent melanin deposits (PPD) after 2-4 hours of sun exposure. The degree of PA protection is PA+, PA++, and the more PA+++ words, the better the effect of preventing UVA, and the longer the effective protection time.

PA+: Indicates that it is effective, and the protection time is about 2 to 4 hours.

PA++ means quite effective, with a protection time of 4 to 8 hours.

PA++ means very effective, with a protection time of more than 8 hours.

There are advantages and disadvantages, and the higher the sun protection index, the greater the damage

1. The protection time is different.

SPF stands for Sun Protection Factor, which indicates the level of sunscreen efficacy that sunscreen products can exert and is determined according to the lowest dose of erythema. The coefficient after the SPF value refers to a time frame in which UV exposure to ** is not harmful, assuming that the intensity of UV rays does not change over time, a person without any sun protection measures will turn red after 20 minutes in the sun.

Therefore, when using SPF15 sunscreen, it means that it can be extended by 15 times, that is, it will not be tanned after 300 minutes**. When using SPF30 sunscreen, it means that the time is extended by 30 times, that is, the sun protection effect is lost after 600 minutes.

2. The applicable ** type is different.

SPF15 is suitable for light-sensitive skin, while SPF30 is suitable for fair skin. In general, SPF 8 to 12 is advisable for ordinary type ** of personal sunscreen; **For fair-skinned people, use SPF30; For those who are allergic to light, it is advisable to choose an SPF value between 12 and 20.

3. The application is different.

SPF 15 is suitable for daily commuting, while SPF 30 is suitable for long outdoor activities. Just be exposed to the sun on the way to and from work, and choose me with a sun protection index below 15. When you are active in the scorching sun of the plateau or go swimming on the beach, you should choose a sunscreen with SPF30.

The choice of sunscreen products should be based on two indicators, SPF and PA. Let's talk about how much sunscreen SPF value should not be exceeded?

Sun Protection Factor (SPF) refers to the SPF sun protection factor, which is an indicator of the ability of a sunscreen to protect UVB from UVB damage in the sun, indicating the sunscreen effect that a sunscreen product can play.

Sunscreen can reduce the amount of UV rays that reach. The higher the SPF, the better the sun protection, but no matter how high the SPF is, it cannot block 100 UVB, and the blocking function is proportional to the multiple of the number.

To protect against UV rays, sunscreens often contain mesalazine filters or substances such as benzophenone, titanium dioxide, zinc oxide, and sometimes whitening antioxidants such as vitamin A, vitamin C, and vitamin E.

Daily work of daily living: SPF index of 15, Pa+ is sufficient. Tourism, Sports:

With an SPF of more than 30, PA++ or more, sunscreen products must also be waterproof. Sensitive **mm try to avoid choosing a high index, SPF15 is already OK, and must be strengthened with continuous supplementation to improve the skin's barrier muscle energy.

In the same brand of sunscreen, SPF 30 is higher than SPF 15.

The difference between SPF15 and SPF30 is their sun protection time.

15 is suitable for daily commuting, while 30 is suitable for long outdoor activities, such as at the beach, and reapply every 2 hours.

15 is suitable for usual sun protection, 30 is suitable for traveling, but it can only work for 2 hours, so it is best to make up every 2 hours.

One is 15 times sunscreen, the other is 30 times, and 30 times the sunscreen effect is good.

SPF is the abbreviation of Sun Protection Factor, it can protect UVB, the multiple of the back is multiplied by 15, such as SPF15, multiplied by 15, which means that there is 225 minutes of protection ability, PA is the abbreviation of Protection UVA, it can protect UVA, the plus sign at the back indicates that PA is divided into three protection levels, that is, + effective, ++ quite effective, ++ very effective, and now they are emphasizing that UVA is the culprit that promotes skin aging, If you usually stay indoors for a long time, then SPF20 PA++ is enough, if you are outdoors for a long time, you must choose a higher SPF40 PA++ or more, and you will have to make up for it after a few hours!

Are you sure it's SPF15+++ counterfeit goods? How can it be marked like that?

SPF is SPF, PA is PA, and the sun protection values of the two are marked with Arabic numerals and + respectively, that is, SPF8 60 and PA++ have never been SPF15+++, are you mistaken?

SPF stands for the protection factor of ultraviolet UVB, 1 SPF value represents how long the skin can be sunburned without any protection without sunburn, the general yellow race is calculated by 15 minutes, SPF15 is sunscreen for 225 minutes, it is recommended to use October Angel Light Natural Sunscreen SPF15, pure physical sunscreen, light texture.

SPF stands for sun protection value, and it is recommended to use SPF 30 in the summer when the UV intensity is current

Each SPF1 represents 20 minutes of sun protection, and so on.

Sunscreen SPF can reach a maximum of 95 or more.

The SPF is SPF2 6 for low-grade sunscreens, SPF6 8 for medium-grade products, SPF8 12 for high-level sunscreens, and products with SPF values in the range of 12 30 are considered high-strength or ultra-high-strength sunscreens.

According to the "Hygienic Standards for Cosmetics" officially implemented in China on July 1, 2007, when the SPF value of the measured sunscreen cosmetics product is higher than 30, and it is still greater than 30 after subtracting the standard deviation, the maximum SPF can only be marked with SPF30+, but not the measured value.

The announcement on the issuance of the administrative requirements for the labeling of sunscreen cosmetics (Announcement No. 107 of 2016 of the State Food and Drug Administration) requires that "the labeling of the sun protection index (SPF) shall be based on the SPF value actually measured by the product". According to the requirements of the method for the determination of the sun protection index (SPF) of sunscreen cosmetics, taking into account the sampling error during the determination and the traditional labeling habits of the cosmetics industry, the labeling value of the sun protection index (SPF) of sunscreen cosmetics should follow the following principles:

1) When the SPF value is 2 5 (including 2 and 5), the measured SPF value is identified;

2) When the SPF value is 6 50 (including 6 and 50), the upper limit of the logo is the measured SPF value, and the lower limit of the logo is the smaller value between the lower limit of the confidence interval of 95% of the measured value and the maximum integer multiple of less than 5 of the measured value.

3) When the SPF value is greater than 50 and the lower limit of the 95% confidence interval of the measured value is greater than 50, the sun protection index (SPF) of sunscreen cosmetics should be marked with "50+"; When the SPF value is greater than 50 and the lower limit of the 95% confidence interval of the measured value is less than or equal to 50, the upper limit of the logo is "50+", and the lower limit of the indicator is the lower limit of the 95% confidence interval of the measured value.

The only ones I've used are SPF50 PA+++, UVB) from the Lancôme Soft Skin Soothing Sunscreen series, but the 60 you mentioned also has La Roche-Posay Special Care Sunscreen SPF60. 120's completely unheard. The highest value seen in person is Neutrogena Super Dry Oil-Free Refreshing Sunscreen SPF70

There are in foreign countries, and in China, as long as they are more than thirty, they are generally 30+, so it is displayed!

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, SPF 30 = 30 * 10 = 300 minutes, SPF 50 = 50* 10 = 500 minutes.

I've seen a sunscreen brand for surfers that has about SPF100, and the highest one I've used myself is SPF90, but I recommend using it often, I think**It will not be able to rot!

It is best to apply sunscreen every two hours.

It's best to get an SPF of 50 or 30 when you go to the beach.

Formula: SPF15 = 15 x 20 60 = 5 (hours).

I just saw this formula on TV two days ago.