ASTM_D_2260_-_03_2013.pdf

Designation:D226003(Reapproved 2013)Standard Tables ofConversion Factors and Equivalent Yarn Numbers Measuredin Various Numbering Systems1This standard is issued under the fixed designation D2260;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 These tables include(1)a series of conversion factorsrequired to convert the number of a yarn measured in a specificsystem to the equivalent number measured in various othersystems(see Table 1),and(2)specific equivalent numbers foryarns measured in various systems(see Table 2).1.2 The content is basically consistent with recommenda-tions of the International Organization for Standardization(ISO)Standard 2947.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD4849 Terminology Related to Yarns and FibersSI10 Standard for Use of the International System of Units(SI):The Modern Metric System32.2 ISO Standard:Standard 2947 TextilesIntegrated Conversion Table for Re-placing Traditional Yarn Numbers by Rounded Numbersin the Tex System42.3 NIST Standard:NIST Circular M121,January 193653.Terminology3.1 Refer to Terminology D4849 for definition of thefollowing ters used in this standard:American graincount;cotton count;cut,in asbestos and glass yarns,cut,in woolyarns;denier;direct yarn numbering systems;grain,in yarnspinning;grain,in measuring mass;indirect yarn numberingsystem;linear density;lea,in linen yarns;metric count;run,inthe american woolen system;tex;worsted count;yarn number;and yarn numbering system.3.2 Refer to Terminology D123 for definitions of otherterms used in this standard.4.Conversion Factors for Equivalent Yarn Numbers4.1 Calculate any equivalent value using the appropriatefactor listed in Table 1.5.Use of Previously Calculated Equivalent YarnNumbers5.1 For a specific number in a stated system,read theequivalent in the various other systems from Table 2.5.2 With a few exceptions,fractional traditional indirectcounts have been omitted from Table 2;the rounded tex systemvalues for most fractional traditional indirect counts can beobtained by interpolation.6.Implementation of the Tex Yarn Numbering System6.1 In Table 2,to encourage the implementation of the texsystem in the United States,rounded tex values were chosen to1These tables are under the jurisdiction of ASTM Committee D13 on Textilesand are the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2013.Published September 2013.Originallyapproved in 1964.Last previous edition approved in 2009 as D2260 03(2009).DOI:10.1520/D2260-03R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Excerpts from SI 10,Standard for Use of the International System of Units(SI):The Modern Metric SysteSI10,can be found in the Annual Book of ASTMStandards,Vols 07.01 and 07.02.The standard is available as a separate publicationand appears in its entirety in Vol 14.02.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 accommodate as many yarn numbers as possible for thetraditional yarn numbering systems without encroaching onestablished tolerances.In addition to the rounded tex systemvalues,the decitex(dtex)equivalents have been includedbecause they can be used throughout most of the count rangewithout employing decimal fractions.The choice of unit isentirely a matter to be determined by each sector of the trade;decitex,for example,is particularly suitable for fine yarns(whether spun or filament)and tex for medium and coarseyarns.7.Derivation of Data in Table 27.1 Tables 1 and 2 are based on the following exactequivalents:7.1.1 1 yd=0.9144 m.7.1.2 1 lb=453.592 37 g.7.1.3 1 lb=7000 grains.7.2 The following conversion factors have been computedwhere y=yards per pound.7.2.1 Woolen run(wr)=y/1600.7.2.2 cotton count(cc)=y/840.