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==== Cotton classification ====
Cotton classification, or classing, is the process of classifying cotton based on its grade, [[Staple (textiles)|staple length]], and micronaire.<ref>{{Cite web |title=Cotton Properties |url=https://www.cottoninc.com/quality-products/nonwovens/cotton-fiber-tech-guide/cotton-properties/ |access-date=2022-04-07 |website=www.cottoninc.com}}</ref> Micronaire is a measure of [[cotton maturity]].<ref>{{Cite web |title=2.2.1-Cotton Value Addition-Micronaire |url=https://www.cottonguide.org/cotton-guide/cotton-value-addition/micronaire/ |access-date=2022-04-07 |website=www.cottonguide.org }}{{Dead link|date=August 2025 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Maturity of cotton fibers is measured with single fiber measurement test or by double compression air flow test. It is expressed in percentage or maturity ratio.<ref name=":12">{{Cite book |last=Centre |first=International Trade |url=https://books.google.com/books?id=dHL-DwAAQBAJ&q=the+relative+wall+thickness+(i.e.+the+area+of+the+cell+wall+to+that+of+a+circle+with+the+same+perimeter+as+the+fibre,+or+the+ratio+of+the+cell+wall+thickness+to+the+overall+%E2%80%98diameter%E2%80%99+of+the+fibre) |title=Cotton Exporter's Guide |date=2007-12-31 |publisher=United Nations |isbn=978-92-1-361490-7 |language=en}}</ref>
==== Micronaire ====
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