### Standard Tables of Conversion Factors and Equivalent Yarn Numbers Measured in Various Numbering Systems

Active Standard ASTM D2260 | Developed by Subcommittee: D13.58

Book of Standards Volume: 07.01

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1. Scope

1.1 These tables include (1) a series of conversion factors required to convert the number of a yarn measured in a specific system to the equivalent number measured in various other systems (see Table 1), and (2) specific equivalent numbers for yarns measured in various systems (see Table 2).

TABLE 1 Conversion Factors for Converting from One Yarn Numbering System to AnotherA
 System for Which Yarn Number is Needed System for Which Yarn Number is Known TexB Denier American Grain Count Cotton Count Worsted Count Woolen Run Metric Count Linen Lea Woolen Cut Yd/lb TexB (g/1000 m) tex = ... 0.590 541 × gr Denier (g/9000 m) den = 9 × tex ... 5.314 87 × gr American Grain Count (grains/120 yd) gr = ... Cotton count (840 yd lengths/lb) cc = ... 0.590 541 × mc Worsted count (560 yd lengths/lb) wc = 1.5 × cc ... 0.885 812 ×mc Woolen run (1600 yd lengths/lb) wr = 0.525 × cc 0.35 × wc ... 0.310 034 × mc 0.187 5 ×lea Metric count (1000 m/kg) mc = ... Linen lea (300 yd lengths/lb) lea = 2.8 × cc 1.866 67 × wc 0.187 5 × wr 1.653 52 × mc ... Yards per pound (yd/lb) y = 840 × cc 560 × wc 1600 × wr 496.055 × mc 300 × lea ...
A The conversion factors are based on the following relationships given in Metric Practice SI 10SI10: 1 yard = 0.9144 m, exactly, and 1 lb (avoirdupois) = 0.453 592 37 kg, exactly. The conversion factors in Table 1 containing fewer than six significant digits are exact values.
B Multiples and submultiples of this basic unit may be used as a convenience to avoid large numbers or decimal fractions. For example, decitex (dtex) or tex × 10 is suitable for fine yarns and fibers; millitex (mtex) or tex × 1000 is suitable for fibers; while kilotex (ktex) or tex/1000 is often used for ropes, cords, rovings, tops, and slivers.

Examples of Table 1 use:

1) The English worsted count equivalent to a cotton count of 10 is 1.5 times 10, or 15 English worsted count.

2) The cotton count equivalent to 30 tex is 590.54 divided by 30, or 19.7 cotton count.

1.2 The content is basically consistent with recommendations of the International Organization for Standardization (ISO) Standard 2947.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D123 Terminology Relating to Textiles

D4849 Terminology Related to Yarns and Fibers

SI10 Standard for Use of the International System of Units (SI): The Modern Metric System Excerpts from SI 10, Standard for Use of the International System of Units (SI): The Modern Metric Syste, can be found in the Annual Book of ASTM Standards, Vols 07.01 and 07.02. The standard is available as a separate publication and appears in its entirety in Vol 14.02.

ISO Standard

Standard 2947 Textiles-Integrated Conversion Table for Replacing Traditional Yarn Numbers by Rounded Numbers in the Tex System Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

NIST Standard

NIST Circular M121, January 1936 Available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.

ICS Code

ICS Number Code 59.080.20 (Yarns)

UNSPSC Code

UNSPSC Code 11151700(Yarns)

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DOI: 10.1520/D2260

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Citation Format

ASTM D2260-03(2013), Standard Tables of Conversion Factors and Equivalent Yarn Numbers Measured in Various Numbering Systems, ASTM International, West Conshohocken, PA, 2013, www.astm.org