Uster tests for cotton yarn
Uster test results document the quality of cotton yarn, whether it is open-end, carded or combed. Here is what the main values mean.
What the report shows
- Evenness (CVm, %): variation of the yarn mass along its length. Lower is better.
- Imperfections per kilometer: thin places (minus 50%), thick places (plus 50%) and neps (plus 200%). Fewer means a cleaner fabric.
- Hairiness (H): the average length of fibers protruding from the yarn. It affects fabric look, pilling and weaving behavior.
- Tensile properties: tenacity (cN/tex) and elongation (%), which show how the yarn behaves in knitting and weaving.
- Count (Ne) and its variation, and the twist level.
How to compare results
- Compare yarn of the same count and type. Combed yarn normally shows fewer imperfections than carded, and open-end yarn has its own typical profile.
- Use the Uster Statistics percentiles as a benchmark: the lower the percentile, the better the yarn compared with the world average.
- Check how many bobbins or cops were tested, the test date and that the report belongs to your lot.
How East Cotton helps
East Cotton supplies cotton yarn (OE, carded, combed, NE 10/1 to NE 50/1) and poly cotton yarn with official Uster tests, from spinning mills in Uzbekistan and Tajikistan.
General guidance. Tolerances and limits are always set in your contract.