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Designation: D8394 − 21 (Reapproved 2026)Standard Test Method forAutomated Measurement of Maturity, Fineness, RibbonWidth, and Micronaire of Cotton Fibers 1This standard is issued under the f i xed designation D8394; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of lineardensity (gravimetric f i neness hereafter stated as f i neness),maturity, micronaire, and ribbon width of cotton f i bers from aloose, chemically untreated sample taken before harvest, dur-ing ginning, during mill processing or unraveled from raw(undyed) yarn or fabric.1.2 This test method requires the use of an integratedinstrument, for example, the Cottonscope (see Fig. 1), thatmeasures the maturity, f i neness, ribbon width, and micronaireof cotton f i ber. 2N OTE 1—For another test method to determine the maturity of cottonf i bers, refer to Test Method D1442.1.3 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 3D123 Terminology Relating to TextilesD1441 Practice for Sampling Cotton Fibers for TestingD1442 Test Method for Maturity of Cotton Fibers (SodiumHydroxide Swelling and Polarized Light Procedures)D1776/D1776M Practice for Conditioning and Testing Tex-tilesD7139 Terminology for Cotton FibersE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3. Terminology3.1 Def i nitions:3.1.1 For all terminology relating to D13.11, Cotton Fibers,refer to Terminology D7139. The following terms are relevantto this standard; f i neness, maturity, micronaire, ribbon width,and snippet.3.1.2 f i neness, gravimetric, n—the linear mass density off i ber measured in millitex (mtex). Synonymous with lineardensity (ASTM’s def i nition for linear density – mass per unitlength).3.1.3 ribbon width, n—the distance measured in microns(µm) across an individual cotton f i ber width in longitudinalsection viewed under a polarized light microscope.3.1.4 snippet, n—f i bers cut into very short lengths of lessthan 1 mm.3.1.5 For all other terminology related to textiles, refer toTerminology D123.1 This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.11 on Cotton Fibers.Current edition approved July 1, 2026. Published July 2026. Originally approvedin 2021. Last previous edition approved in 2021 as D8394–21. DOI: 10.1520/D8394-21R26.2 The sole source of supply of the apparatus known to the committee at this timeis Cottonscope Pty. Ltd., 13 Willcock Street,Ardross 6153, WesternAustralia. If youare aware of alternative suppliers, please provide this information to ASTMInternational Headquarters. Your comments will receive careful consideration at ameeting of the responsible technical committee, 1 which you may attend.3 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1