SPFväärtusele

SPFväärtusele, often abbreviated as SPF, refers to the Sun Protection Factor. It is a measure of how well a sunscreen or other product protects the skin from ultraviolet B (UVB) radiation. The SPF number indicates how much longer it would take for skin to redden or burn compared to when no protection is used. For example, an SPF 15 sunscreen theoretically allows you to stay in the sun 15 times longer without burning than you could without any protection.

It is important to understand that SPFväärtusele primarily measures protection against UVB rays, which are the main cause of sunburn. However, UVA rays also contribute to skin damage, including premature aging and an increased risk of skin cancer. Therefore, it is recommended to use broad-spectrum sunscreens that protect against both UVA and UVB radiation. The effectiveness of SPF is also dependent on factors such as application amount, reapplication frequency, and individual skin type.

Higher SPF numbers offer greater protection, but the increase in protection is not linear. For instance, SPF 30 blocks about 97% of UVB rays, while SPF 50 blocks about 98%. While higher SPFs can be beneficial, especially for individuals with fair skin or those who burn easily, consistent application and reapplication remain crucial for optimal sun protection. Choosing an SPF that is appropriate for your skin type and the intensity of sun exposure is a key step in preventing sunburn and long-term skin damage.