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23 Μαΐ 2024 · UVA rays can penetrate your skin more deeply and cause your skin cells to age prematurely. About 95% of the UV rays that reach the ground are UVA rays. The other 5% of UV rays are UVB.
5 Μαΐ 2022 · The sun protection factor is a measure of the fraction of sunburn-producing UV rays that reach the skin. For example, “SPF 15” means that 1⁄15 of the burning radiation will reach the skin, assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter (mg/cm 2).
17 Απρ 2018 · What are UVA star ratings? Many forms of sun protection carry a UVA star rating on the bottle - Boots developed this rating system in 1992, and it was Europe’s first measurement system for UVA protection. Ranging from 0 to 5, this rating indicates the percentage of UVA radiation that’s absorbed by that particular sun protection, compared to UVB.
There are two basic types of ultraviolet rays that reach the earth’s surface—UVB and UVA. UVB rays are responsible for producing sunburn. The UVB rays also play the greatest role in causing skin cancers, including the deadly black mole form of skin cancer (malignant melanoma).
The sun emits two types of UV radiation that reach our skin: ultraviolet A (UVA) and ultraviolet B (UVB). Both types damage unprotected skin, but in different ways. Knowing the difference between UVA and UVB rays is essential to understanding the need for broad spectrum sun protection.
What does SPF mean? SPF stands for Sun Protection Factor. It measures the amount of protection that your skin gets from ultraviolet B (UVB) radiation. What is the difference between SPF 30 and 50? Sunscreens with an SPF rating of 50+ offer the strongest protection against UVB rays.
1 Ιουν 2020 · The UVA seal – a logo with ‘UVA’ inside a circle indicates that the product conforms to EU recommendations for UVA protection which is equivalent to at least one third of the SPF. Often you will see a star rating for UVA, ideally pick one with a minimum of 4 stars.
