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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:

Weaving machine for pile fabrics or velvets whereby the pile is made by weaving steel rods or wires into the fabrics. When the wires are extracted the warp ends that have been woven over the wires...
A fibre formed by the conjunction at a spinning jet, of two fibre-forming polymers of different properties. NOTE: a) The two components may be caused to merge approximately side by side...
A variation of a 1x1 rib stitch with 2 sets of needles There is alternate knitting and tucking on one course then tucking and knitting on the next course. The fabric has the same look on both sides...
A cotton yarn that has been carded but not combed. Carded yarns contain a wider range of fiber lengths and, as a result, are not as uniform or as strong as combed yarns. They are considerably cheaper...
A generic term for a low-quality plain-weave fabric of the muslin type with traditional cover factors for both warp and weft of about 4. NOTE: The mass per unit area of the fabric will vary with...

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