Standard Practice for Use of the Tex System to Designate Linear Density of Fibers, Yarn Intermediates, and Yarns

SIGNIFICANCE AND USE
4.1 The tex system has been approved for general use by the International Organization for Standardization, Technical Committee 38 on Textiles (ISO/TC 38), which has also recommended a list of rounded tex numbers for use with fibers and all types of yarns. Conversion tables showing the rounded tex numbers corresponding to various numbers in different traditional systems are given in Tables D2260 and ISO 2947.  
4.2 The tex system for designation of the linear density of fibers and yarns is a direct system based on mass per unit length, M/L, and employs metric units of length and mass. The tex unit, grams per kilometre (1000 m) has been approved by ISO/TC 38 for use with all fibers and all types of yarn. The committee has also approved the use of kilotex and decatex numbers for coarse structures and decitex and millitex numbers for fibers.  
4.3 The tex system relates to the property commonly associated with coarseness, or inverse fineness of a yarn because the tex numbers increase with an increase in the size or mass per unit length of the yarn. The tex system is intended for use by all branches of the textile industry, in all countries, for yarns made from all types of fibers or mixtures of fibers.
SCOPE
1.1 This practice covers the use of the tex system to designate the linear density (number, or count) of fibers and of yarns made from any type of fiber or combination of fibers. It is also applicable to other textile materials, including yarn intermediates (slivers, rovings, tops, and so forth), single or plied yarns, cords, and threads.  
Note 1: The mass per unit length concept of linear density is applicable to any material which has a high ratio of length to cross section.  
1.2 Conversion factors for various indirect and direct yarn numbers to exact tex equivalents can be found in Standard Tables D2260.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
30-Jun-2018
Technical Committee
Drafting Committee
Current Stage
Ref Project

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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D861 − 07 (Reapproved 2018)
Standard Practice for
Use of the Tex System to Designate Linear Density of
Fibers, Yarn Intermediates, and Yarns
This standard is issued under the fixed designation D861; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2.2 ISO Standards:
ISO2947 Textiles—IntegratedConversionTableforReplac-
1.1 This practice covers the use of the tex system to
ing Traditional Yarn Numbers by Rounded Values in the
designate the linear density (number, or count) of fibers and of
Tex System
yarns made from any type of fiber or combination of fibers. It
is also applicable to other textile materials, including yarn
3. Terminology
intermediates (slivers, rovings, tops, and so forth), single or
plied yarns, cords, and threads. 3.1 For all terminology relating to D13.58, Yarns and
Fibers, refer to Terminology D4849.
NOTE 1—The mass per unit length concept of linear density is
3.1.1 The following terms are relevant to this standard:
applicabletoanymaterialwhichhasahighratiooflengthtocrosssection.
linear density, tex.
1.2 Conversion factors for various indirect and direct yarn
numbers to exact tex equivalents can be found in Standard 3.2 For all other terminology relating to textiles, see Termi-
nology D123.
Tables D2260.
1.3 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 The tex system has been approved for general use by the
priate safety, health, and environmental practices and deter-
International Organization for Standardization, Technical
mine the applicability of regulatory limitations prior to use.
Committee 38 on Textiles (ISO/TC 38), which has also
1.4 This international standard was developed in accor-
recommended a list of rounded tex numbers for use with fibers
dance with internationally recognized principles on standard- and all types of yarns. Conversion tables showing the rounded
ization established in the Decision on Principles for the
tex numbers corresponding to various numbers in different
Development of International Standards, Guides and Recom- traditional systems are given in Tables D2260 and ISO 2947.
mendations issued by the World Trade Organization Technical
4.2 The tex system for designation of the linear density of
Barriers to Trade (TBT) Committee.
fibers and yarns is a direct system based on mass per unit
length, M/L, and employs metric units of length and mass. The
2. Referenced Documents
tex unit, grams per kilometre (1000 m) has been approved by
2.1 ASTM Standards: ISO/TC 38 for use with all fibers and all types of yarn. The
D123 Terminology Relating to Textiles committee has also approved the use of kilotex and decatex
D2260 Tables of Conversion Factors and Equivalent Yarn
numbersforcoarsestructuresanddecitexandmillitexnumbers
Numbers Measured in Various Numbering Systems for fibers.
D4849 Terminology Related to Yarns and Fibers
4.3 The tex system relates to the property commonly asso-
ciated with coarseness, or inverse fineness of a yarn be
...

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