4hw.com.cn: when choosing sunscreen, girls must have heard that sunscreen is 30 times or 50 times. Many girls don't know the difference between 30 times and 50 times.
What do 30 times and 50 times sunscreen mean? What's the difference between 30 times and 50 times sunscreen
What do 30 times and 50 times sunscreen mean
30 times and 50 times of sunscreen generally refer to the sun protection index of sunscreen, and the sun protection index is the test index to measure the sunscreen's defense ability to ultraviolet UVB in the sun, indicating the sun protection efficiency of sunscreen products. Assuming that the skin starts to turn red after 10 minutes of sun exposure without sunscreen products, the product with sun protection index 50 can protect your skin for 500 minutes, A sun protection factor of 30 protects your skin for 300 minutes.
The difference between 30 times and 50 times sun protection: texture
In the products of the same brand and formula, the texture of SPF30 is lighter and more breathable than that of spf50, because the higher the SPF value is, the more sunscreen is added, and the worse the permeability is, which will hinder the normal secretion and respiration of the skin. If it is blain or sensitive skin, it is recommended to use sunscreen products with low SPF.
The difference between 30 times and 50 times sun protection: Safety
The safety of SPF 30 is higher than that of SPF 50, because the higher SPF value is, the more chemical sunscreen is added, and this kind of sunscreen is corrosive, the more it is added, the more corrosive it is. Too much sunscreen is also easy to penetrate into the skin, causing allergies and other problems.
The difference between 30 times and 50 times sunscreen: sunscreen durability
Spf50's sunscreen products are more durable than SPF30's, because SPF30's products can extend the sunscreen time by 30 times, while spf50's products can extend the sunscreen time by 50 times. Of course, the duration of a sunscreen not only depends on SPF, but also PA value. However, for sunscreen with high SPF index, PA value is not low.
The difference between 30 times and 50 times sun protection: suitable for place
SPF 30 has a weak sunscreen ability, but it has a strong safety, which is suitable for traveling or traveling; SPF 50 has a strong sunscreen ability, but a weak safety, which is suitable for bathing beach or tropical tourism.