What's the difference between sunscreen SPF 15 and SPF30?

SPF 15, multiplied by 15, which means it has 225 minutes of protection. SPF30 has 450 minutes of protection. The SPF value is only a reference figure, and it should actually be considered according to the individual's skin quality, sun exposure, skin color, activity and sweating.

2. Different application places

SPF 15 is suitable for daily commuting and SPF 30 is suitable for long-term outdoor activities.

Outdoor people with umbrella protection are suitable to use sunscreen products with SPF of 15-25, which can be applied to lips, forehead and instep. For people who walk and swim, it is suitable to use products with SPF value of 25-30 to reduce the influence of sweating on sunscreen effect.

Extended data:

Wrong idea

1, sunscreen stinks: it's not appropriate to put too much white on your face. Let women brag, forget it. The harm of ultraviolet rays is not limited to tanning and aging, but also may cause a series of skin diseases. Sun protection is not only about beauty, but also about health. Since there is no difference between men and women in the damage caused by ultraviolet rays to the skin, there is no difference between men and women in sun protection.

2, go out and apply it, sunscreen all day: sunscreen should be applied 20-30 minutes before going out, not all day. Sunscreen stays on the skin surface and will be lost with sweating. It should be applied every 1-2 hours to ensure the sunscreen effect. Besides the face, other exposed parts such as the neck and arms can also be coated with sunscreen.

3. Sun protection is limited to summer: although the sun is strong in summer, ultraviolet rays are everywhere. If possible, wear sunscreen all year round, even in rainy weather, especially for people who often work and move outdoors.

Baidu Encyclopedia -SPF (Sun Protection Index)

People's Network-Do you really protect yourself from the sun? Dermatologists teach you how to use sunscreen.