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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:

Pre-delivery preparation for a piece of furniture. This can include inspection for damage, completeness, and proper operation; removal of stickers and tags and minor repairs from manufacturing or...
Plain weave fabric (cotton, silk, rayon, synthetics) having a slightly irregular surface due to uneven slubbed filling yarns. It is a raw silk made from Tussah silk or silk waste, depending on the...
Usually a plain weave, mercerized fabric made of long staple cotton which when treated with dope is used as airplane fabric to cover wings, fuselage or tails. Also used for boys’ suits, shirtings,...
An old form of lithographic printing, for embroidery transfers. The design was transferred from the tissue paper on which it was printed, usually by ironing. Thick enamel-like pigments were employed...
A selvedge that varies in width. NOTE: Variations in weft tension or lack of control of the warp ends within the selvedge may result in such unevenness. Pulled-in selvedges are caused by pulling in...

Companies for UPF:


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