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    ASTM D1577 - 07(2018)

    Standard Test Methods for Linear Density of Textile Fibers

    Active Standard ASTM D1577 | Developed by Subcommittee: D13.58

    Book of Standards Volume: 07.01

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    Significance and Use

    4.1 Option A for bundle weighing of Test Method D1577 is used in the trade for acceptance testing of commercial shipments. Option B for single-fiber weighing and Option C for the vibroscope may be used for acceptance testing (see Section 37); however, caution is advised when using Option B or Option C because between-laboratory precision information is incomplete. Comparative tests as directed in 4.1.1 may be advisable.

    4.1.1 In case of dispute arising from differences in reported test results when using Test Method D1577 for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of samples that are as homogeneous as possible and that are from a lot of material of the type in question. These samples should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using the appropriate statistical analysis and a probability level chosen by the two parties before testing is begun. If a bias is found, either the cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results for that material with consideration to the known bias.

    4.2 Option A for bundle weighing is generally considered to be the referee procedure for acceptance testing.

    4.3 Option A is not recommended for measurement of linear density of blends of production fibers having different nominal linear densities.

    4.4 The accuracy of the linear density values obtained by Options A and B is dependent upon the accuracy with which the fibers can be cut and weighed.

    Note 2: On short staple fiber, an accuracy in cutting of 1.0 % is difficult to obtain. This problem is further complicated if crimp is present in the fibers.

    4.4.1 The accuracy of weighing can be controlled by the number of fibers composing the bundle. However, with short fiber of low linear density the number of fibers to be counted becomes prohibitive unless the bundle mass is kept low.

    4.5 Options A and B are fundamental procedures which are used to standardize the vibroscope equipment used in Options C1 and C2.

    4.6 Test Method Options B and C are most useful for the measurement of linear density of single fibers when further tests upon the same test specimen are required, for example, tension tests and adjustment of the data obtained for the linear density of the test specimen. These options offer advantages in accuracy and ease of operations over calculation from specific gravity and microscopically measured cross-sectional area.

    4.7 Additional information specific to Option C is in Section 26.

    1. Scope

    1.1 These test methods cover the measurement of mass per unit length (linear density) of textile fibers and filaments. Direct weighing and vibroscope procedures with modifications for crimped and uncrimped fibers are included. The options and sections are listed below.






    A—Fiber Bundle Weighing

    7 – 15


    B—Single-Fiber Weighing

    16 – 23


    C—Vibroscope, General

    24 – 30



    35 and 36


    C1—Uncrimped Fibers

    31 and 32


    C2—Crimped Fibers

    33 and 34


    Precision and Bias

    37 and 38

    Note 1: For linear density of short lengths of yarn, refer to Test Method D1059. For cotton linear density, refer to Test Methods D1769 and D2480. For measurement of wool diameter, refer to Test Methods D1282, D2130, and D3510.

    1.2 The crimp, taper, and cross-sectional shape of the fiber may influence the linear density measured by single-fiber weighing and vibroscope.

    1.3 These test methods measure the linear density of fibers with moisture in equilibrium with the standard atmosphere for testing textiles. The fiber moisture under these conditions is not necessarily the same as the commercial moisture regain for the fibers.

    1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

    1.5 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.

    1.6 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.

    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

    D629 Test Methods for Quantitative Analysis of Textiles

    D1059 Test Method for Yarn Number Based on Short-Length Specimens

    D1282 Test Method for Resistance to Airflow as an Indication of Average Fiber Diameter of Wool Top, Card Silver, and Scoured Wool

    D1769 Test Method for Linear Density of Cotton Fibers (Array Sample)

    D1776/D1776M Practice for Conditioning and Testing Textiles

    D1907/D1907M Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method

    D2130 Test Method for Diameter of Wool and Other Animal Fibers by Microprojection

    D2257 Test Method for Extractable Matter in Textiles

    D2480 Test Method for Maturity Index and Linear Density of Cotton Fibers by the Causticaire Method

    D2904 Practice for Interlaboratory Testing of a Textile Test Method that Produces Normally Distributed Data

    D3333 Practice for Sampling Manufactured Staple Fibers, Sliver, or Tow for Testing

    D3510 Test Method for Diameter of Wool and Other Animal Fibers by Image Analyzer

    D4849 Terminology Related to Yarns and Fibers

    D5103 Test Method for Length and Length Distribution of Manufactured Staple Fibers (Single-Fiber Test)

    ICS Code

    ICS Number Code 59.060.01 (Textile fibres in general)

    UNSPSC Code

    UNSPSC Code 11151500(Fibers)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D1577-07R18

    Citation Format

    ASTM D1577-07(2018), Standard Test Methods for Linear Density of Textile Fibers, ASTM International, West Conshohocken, PA, 2018, www.astm.org

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