The SPF (Sun-Protection Factor) value is Numbers used to indicate the level of skin protection from the sun. The different numbers are based on how much more protection from UVB rays is than normal. However, SPF does not show how effective it is at protecting body against UVA rays.
For example, people who don’t wear sunscreen will have red skin after exposure to the sun for 15 minutes. For those who use sunscreen with an SPF of 30. These symptoms will occur after being exposed to the sun for 450 minutes, calculated from the normal time. That the skin can withstand sunlight multiplied by the SPF value that protects the skin from sunlight up to 30 times ทางเข้า UFABET
Additionally, protecting your skin from the sun depends on many factors. Including the amount of time spent in the sun. The time spent in the sun, the environment, the season and the weather. As well as the strength of the sunlight. Friction, contact, sweat, or water, which may cause the effectiveness of the SPF value in actual sunscreen to be lower than the value obtained in the laboratory. People who use sunscreen should avoid being outdoors in bright sunlight for long periods of time. And you must always reapply sunscreen or reapply every 2-4 hours.