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What is "UPF" - Definition & Explanation

(Ultraviolet Protection Factor) The UPF rating indicates how effective a fabric is at blocking out solar ultraviolet radiation from reaching the skin. UPF ratings range from 15 to 50 with higher ratings indicating more effective blocking and therefore better protection for the wearer of a garment. Fabrics that test higher than UPF 50 are rated as UPF50+. UPF testing involves exposing a fabric to ultraviolet radiation (UVR) and measuring how much is tranmitted through the sample. Different wave-lengths of radiation in the UVR spectrum have different effects on human skin and this is taken into consideration when calculating the UPF rating. Factors that contribute to the UPF rating of a fabric are:

Composition of the yarns (cotton, polyester, etc)

Tightness of the weave or the knit (tighter improves the rating)

Color (darket colors are generally better)

Stretch (more stretch lowers the rating)

Moisture (many fabrics have lower ratings when wet)

Condition (worn and faded garments may have reduced ratings)

Finishing (some fabrics are treated with UV absorbing chemicals).

Some other terms

Some more terms:

Fabric is mounted flat and rubbed in a figure eight-like motion using a piece of worsted wool cloth as the abradant. The number of cycles endured before the fabric shows an objectionable change in...
Extruded yarn that has been subjected to a stretching or drawing process which orientates the long-chain molecules of which the yarn is composed, in the direction of the filament axis. NOTE: On...
Dry-heat fixation is a method of fixing reactive dyes printed through the ink-jet method. The dyed/printed fabric is passed through hot iron plates in lieu of steam. This method conserves water and...
(Durable Press) - Terms used to describe a garment which has been treated to retain its fresh appearance, crease, and shape throughout the life of the garment, Permanent press can be a misleading...
A high speed yarn spinning process that creates yarn by transferring twist from previously formed yarn to fiber or sliver continuously fed into the spinning machine. The twisting may be done by...

Companies for UPF:


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