- 'Sun Protection Factor'. It is the relative measure of how long a sunscreen will protect your skin from ultraviolet rays.
- SPF is figured by comparing the amount of time taken to burn a skin protected with sunscreen to the amount of time taken to burn a skin without sunscreen.
- SPF ranges from 8-100.The higher the SPF,higher will be the protection.However the highest recommended is SPF 50.
- Dermatologists recommend using SPF 15 and SPF 30 sunscreen, as SPF 30 itself blocks 97% of UV rays.
- No sunscreen will block 100 percent of the UV rays.
Types of UV rays:
- UVA rays produce sunburn.
- UVB rays penetrate more deeply into the skin and responsible for premature aging and wrinkle formation.