What is SPF? SPF stands for sun protection factor. This rating is used in sunscreens to block radiation of UVB rays, which are the main cause of sun-related damage. SPF 30 blocks 96.7 percent UVB rays, and SPF 50 blocks 98% of UVB rays. Let's discuss SPF in more detail. https://moisturiser-with-spf98482.aioblogs.com/65187529/why-most-people-fail-at-trying-to-moisturizer-with-spf-30