When buying sunscreen, you often see the abbreviations SPF or PA. Many people don't understand what they mean and usually choose sunscreen based on their own feelings. In the following, we will explain in detail the significance of common sunscreen indices such as SPF 50 and SPF 30, so that next time you buy sunscreen, you won't choose randomly.
What is Sun Protection Factor (SPF)?
Sun Protection Factor (SPF) is a measure of a sunscreen's ability to protect against UVB rays. The SPF value represents the level of protection provided by the sunscreen against skin darkening and sunburn. On the other hand, the PA rating measures the sunscreen's protection against UVA rays. The PA rating is usually indicated by a plus sign, with PA+ indicating effective protection, PA indicating equivalent effectiveness, and PA+++ indicating very effective protection.
The Significance of SPF 50
SPF 50 indicates that the sunscreen can provide protection for 750 minutes.
Without any sun protection, the skin of an average person would start to turn red after approximately 15 minutes of sun exposure. SPF 50 means that the sunscreen can extend the time it takes for the skin to turn red by 50 times. In other words, using SPF 50 sunscreen allows for 750 minutes of sun exposure before the skin starts to turn red.
The Significance of SPF 30
SPF 30 means that the sunscreen can provide protection for 450 minutes.
Similarly, after applying SPF 30 sunscreen, the skin can withstand sun exposure for up to 450 minutes before it turns red.
Higher SPF Means Heavier Burden on the Skin
Higher SPF values such as 50 or 30 represent longer protection times, but it doesn't mean that higher SPF is always better. Sunscreens with higher SPF contain more ingredients and can feel heavier on the skin. Prolonged use of high SPF sunscreens can be more damaging to the skin.
SPF 30 is Sufficient for Everyday Use
SPF 50 sunscreen is suitable for people who need to be exposed to intense sunlight for extended periods. For everyday activities or short periods of sun exposure, SPF 30 sunscreen is sufficient. If no outdoor activities are planned, a sunscreen with an SPF of 15 can be used. Additionally, people with fair skin who want to prevent the formation of dark spots can choose sunscreen with an SPF of 30 or higher, while those with darker skin can use sunscreen with an SPF of 15.
