TextileGlossary.com

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:

This is both the name of a fabric and a fiber. A manufactured fiber introduced in the early 1950s, it is second only to cotton in worldwide use. Its ability to stretch and resist wrinkling makes it a...
A combination or association of molecules that may be of one compound or two or more compounds that react, simultaneously or consecutively, to form a regular system of molecules (usually of high...
A manufactured fiber, which like acetate, is made by modifying cellulose. However, even more acetate groups have been added to create this fiber. Triacetate is less absorbent and less sensitive to...
For film-forming wood finishes, the measure of reflectivity of light. This is normally measured as a percent of light reflected at a 60 degree incident. So it ranges from 0 to 100. Different...
The force necessary to tear a fabric, measured by the force necessary to start or continue a tear in a fabric. Expressed in pounds or in grams, the most commonly used method for determining the tear...

Companies for UPF:


If you manufacture, distribute or otherwise deal in UPF, please fill your company details below so that we can list our company for FREE!

Add a definition

Add a definition for a textile term that you know about! Send us an email & tell us:
  • The term you want to define
  • Its definition in 500 words or less
  • Attach an image if necessary.
  • Optionally, tell us anout yourself in 200 words or less!

(s) 2017 TextileGlossary.com Some rights reserved. • Sitemap