 TripleJSunProtection.com has used International UV Testing
Laboratories since 1999 for our products that we personally manufacturer.
The International UV Testing Laboratories (IUVTL) has
tested more fabrics for UV properties than any other laboratory in the world. They provide the most complete and comprehensive UV fabric and garment testing
available today.
UVBlock® is the official certification provided by the International UV Testing
Laboratories. Look for this block on garments to ensure full sun protection requirements.
The difference between SPF vs. UPF is this:
SPF
SPF stands for Sun
Protection Factor. It is the ratio of UV radiation dose required to produce
recognizable redness on skin that has been protected with a sunscreen from the
UV radiation dose required to produce the same redness on unprotected skin
(using a clinical test procedure on human skin). SPF tells you how much longer
it will take for your skin to begin to redden with the product on than if your
skin was unprotected. The percentage of burning UV rays that a product blocks
does not increase proportionally with the SPF value. So SPF values indicate a
function of skin reddening.
UPF
UPF stands for
Ultraviolet Protection Factor. It is the ratio of the average effective
ultraviolet radiation (UVR) irradiance transmitted and calculated through air to
the average effective UVR irradiance transmitted and calculated through fabric.
In other words, it is the amount of ultraviolet radiation that a fabric blocks.
Hence UPF values are used in the Fabric's UV transmittance test by
spectrophotometer equipment
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