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:

An alternative, non-harmful method of producing silk. Silk is woven by making use of empty cocoons rather than harvesting live moth pupae. Cultivated on forest trees, the silk is spun after the...
A toothed, comb-like part of a LOOM. Its function is to hold the strands of longitudinal yarn (WARP) in alignment between its teeth and also to push each transverse thread (PICK) tight against the...
A warp knit fabric of silk, rayon, or synthetics in which the fabric is formed by interlooping adjacent parallel yarns. The warp beam holds thousands of yards of yarns in a parallel arrangement, and...
Of or relating to habitat or household, mostly used as a prefix related to ecology. Eco comes from the ancient Greek word "oikos" (house). e. g. eco-label, eco-friendly, eco-shopping. Within the...
The term used for passing fabric through big continuous ovens called stenters. In addition to just drying stenters can align fabrics, set fabrics, apply chemicals to fabrics via pad mangles. Stenter...

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