What is the difference between spf20 and spf30 sunscreen? It is recommended to use high-multiple sunscreen when going out in summer.

What is the difference between SPF20 and SPF30? When summer comes, it is the season for many girls to choose and stock up on sunscreen. So what are the differences between SPF20 and SPF30 sunscreens? If you don’t know the meaning of SPF, come and learn about it.

The difference between SPF20 and SPF30

The main difference between SPF20 sunscreen and SPF30 sunscreen is how much UVB rays they absorb.

SPF 20 = (20-1)/20*100% ≈ 95%, which means that about 5% of UVB rays can reach the skin. SPF 30 = (30-1)/30*100% ≈ 96.67%, which means that about 3.33% of UVB rays can reach the skin.

The difference between SPF20 and SPF30: sunscreen ingredients

SPF20 and SPF30 sunscreen products not only differ in SPF values, but also in sunscreen ingredients. Even within the same brand and the same series of products, an SPF30 sunscreen has more chemical sunscreen ingredients than an SPF20 sunscreen. Because only by adding more chemical sunscreen ingredients can a higher SPF value (the ability to protect against UVB rays) be achieved.

The difference between SPF20 and SPF30: skin feel

There will also be differences in skin feel between SPF20 and SPF30 products. This is actually caused by the different content of sunscreen ingredients in the two types of products. Generally speaking, the higher the sunscreen factor, the more sunscreen ingredients it contains, and the skin will feel relatively greasier. It is particularly important to note that the more chemical sunscreen ingredients there are in a sunscreen, the more penetrating it is into the skin. However, this potential impact on the skin is nothing compared to the damage caused by ultraviolet rays to the skin. When going out in the summer, it is even more necessary to use SPF30 sunscreen products.

How to choose between SPF20 and SPF30

SPF20: Suitable for short-term outdoor or indoor sun protection on cloudy days (in addition to paying attention to SPF, you should also note that the PA value must have at least a + sign, because the PA value reflects the product's protection against UVA, the higher the value, the better).

SPF30: Suitable for short-term exposure to strong sunlight, such as commuting to and from get off work in midsummer (at the same time, the PA value of sunscreen skin care products must have at least two + signs).

SPF50: Suitable for use when doing outdoor sports for a long time in summer. In areas with strong ultraviolet rays such as plateaus or beaches, it is necessary to choose sunscreen skin care products with an SPF50 PA value of three + or above, and apply it every 1-2 hours to truly allow the sunscreen product to protect the skin from damage by ultraviolet rays.