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SPF vs. UPF- What is the difference?
SPF vs. UPF- What is the difference?
Both SPF (Sun Protection Factor) and UPF (Ultraviolet Protection Factor) are standards used to measure sunburn protection. SPF, the standard used to measure the effectiveness of sunscreens, has been around for many years. The UPF system is relatively new and was created specially for sun protective fabrics. At first, American sun protective fabrics were rated using the SPF standard until the FTC finalized the UPF standard we have today. Use of the UPF standard is voluntary so some sun protective fabric manufactures still use the SPF system.
SPF Rating System
SPF measurements are done on human subjects. SPF, is a gauge of how much time a person can be exposed to the sun before getting burned. For example, if you burn in 10 minutes without sunscreen and you apply a liberal dose of sunscreen with a SPF number of 15, you should be protected from a sunburn for 150 minutes. Although sunscreens with identical SPF numbers give you equivalent sunburn protection from UVB rays, no sunscreen product screens out all UVA rays. Some may advertise UVA protection, but the current SPF standard does not measure the amount of UVA protection.
Although experts still believe that UVB is responsible for much of the skin damage caused by sunlight --especially sunburn-- UVA may be an important factor in other types of sun damage, including premature aging, wrinkles and the development of skin cancers. For more detailed information on the differences between UVA vs. UVB rays, check out our blog post here.
UPF Rating System
UPF measurements of fabrics are generally tested by spectrophotometer equipment and are not tested using human subjects. The UPF rate indicates how much of the sun's UV radiation is absorbed by the fabric. For example, a fabric with a UPF rating of 50 only allows 1/50th of the sun's UV radiation to pass through it. This means that this fabric will reduce your skin's UV radiation exposure by 50 times (98% UV block) in areas where the skin is protected by the fabric.
One big advantage of the UPF standard is that both UVB AND UVA are measured.
The table below illustrates the different UPF protection ranges and the percentage UV blocked. Sungrubbies products are all tested by independent laboratories and we maintain that most of our UPF products are UPF 50 +.
| Protection Category | UPF Range | UPF Values Allowed on Labels |
Approximate % UV Blocked
|
|
Good UV Protection
|
15 - 24
|
15 and 20
|
93.3% - 95.8%
|
|
Very Good UV Protection
|
25 - 39
|
25, 30 and 35
|
96.0% - 97.4%
|
|
Excellent UV Protection
|
40 - 50+
|
40, 45, 50 and 50+
|
97.5% - 98.0%
|
We tried to simplify this post so that it's easier to follow and understand. Feel free to share your comments with us.
Excellent comprehensibility and yet brief. Very good for quick information seeker.
Hi . I live in durban and I’m Interested in the in purchasing The Good UV Protection Range… small and medium size. How do I go about purchasing the product and at what price . Will await your quick response…
Fantastic explanation and breakdown of SPF/UV sun protection fabric and sunscreen. This information is soooooo important!
30 years ago, it’s no wonder why my mom was always saying, “I hope you applied sunscreen” “protect your face, wear a hat!” “The suns strongest rays are between 10 a.m. and 2 p.m.”…as I slathered on baby oil, coconut oil, and Ban de Soile tanning goop.
Thanks for the explanation, it’s very easy to understand with the help of the table.
All well and good but today we are getting UV C in large amounts. Even some phone apps will reveal the amounts. X-Ray follows UVC in the spectrum.
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