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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:

A narrow fabric made by crossing a number of sturdy yarns diagonally, so each strand passes alternatively over or under one or more of the other stands. Typically used in shoe laces and suspenders....
A finishing process in which the fabric is wound tightly onto a perforated roller and either immersed in hot water, which is also circulated through the fabric (wet decatising) or has steam blown...
The term fur refers to the fine, soft body hair of non-human mammals. True fur comes from animals where the coat consists of short ground hair and long guard hair. Fur served as an important source...
a) A machine for dyeing fabric in rope form and in which the fabric is carried through a narrow throat by dye liquor circulated at high velocity. b) A machine for dyeing garments and in which the...
A fabric woven of silk and cotton, the warp of one material and the weft of the other. Literally, 'that which is in accordance with the shara, Muslim holy law, which disapproves of an arel made of...

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