You know the SPF (Sun Protection Factor) of your sunscreen, but do you know the UPF (Ultraviolet Protection Factor) of your clothes?
The difference between SPF (Sun Protection Factor) and UPF (Ultraviolet Protection Factor) is mainly in their usage and application.
1. SPF (Sun Protection Factor):
- Used for sunscreens and sun protection products.
- Measures the level of protection against UVB rays, which are responsible for sunburn and can contribute to skin cancer.
- For example, a sunscreen with an SPF of 30 means that you can theoretically spend 30 times more time in the sun without burning compared to not using protection. However, this depends on several factors, including skin type and the application of the product.
2. UPF (Ultraviolet Protection Factor):
- Used for clothing and textiles.
- Measures the level of protection of tissues against UVA and UVB rays.
- A UPF of 50 means that only 1/50th of UV light can pass through the fabric, providing high UV protection. It also means that the garment blocks approximately 98% of UV rays.
- A UPF of 15 is the minimum value to be considered "sun protection"
While UV radiation is harmful, UVB rays play a vital role in the synthesis of vitamin D in our bodies. Here’s how it works:
1. Synthesis of vitamin D: