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What is "Ultraviolet Protection Factor UPF" - Definition & Explanation

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 general classification of strong, firm, closely woven fabrics usually made with cotton. A heavier, open weave comprised of plied yarns (a number of single yarns, usually three, twisted together)....
A fabric made from yarns with low luster, such as cotton or other staple length fibers. The fabric has a soft, smooth hand and a gentle, subtle luster. Sateen fabrics are often used for draperies and...
A finishing process for woven or knit fabrics in which brushes or other abrading elements are used to raise a nap (a fuzzy or downy surface). Brushed fabrics have a soft, slightly weathered,...
1A device that uses heat and pressure to remove wrinkles and creases and smooth fabrics during garment construction. 2. A device used to press or compress raw materials. 3. To iron in the home or...
An insoluble colorant is printed on the fabric as a paste or emulsion, heat cured and bound to the fabric with resins or binders. Allows for the printing of fabrics with fiber blends that would be...

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