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    ASTM D7409 - 15(2020)

    Standard Test Method for Carboxyl End Group Content of Polyethylene Terephthalate (PET) Yarns

    Active Standard ASTM D7409 | Developed by Subcommittee: D35.02

    Book of Standards Volume: 04.13


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    Significance and Use

    5.1 This test method can be used for manufacturing quality control or manufacturing quality assurance purposes to determine the CEG concentration of PET yarns used in either geogrids or geotextiles.

    5.2 The CEG content of the PET yarns may have an influence on the properties of the geosynthetic, such as its hydrolysis resistance. The lower the value, the higher the hydrolysis resistance of the yarns.

    5.3 This test does not set the limiting (maximum) value for various engineering applications. Such a specification is a decision of the design engineer, owner, and/or regulator.

    1. Scope

    1.1 This test procedure is based significantly on the GRI GG7 test procedure, Carboxyl End Group Content of Polyethylene Terephthalate (PET) Yarns.

    1.2  This test method is used to determine the concentration, in mmol/kg, of carboxyl end groups (CEG) found in poly(ethylene terephthalate) (PET) yarns by titration.

    1.3 This test is applicable to geogrid yarns that are made from PET resin.

    Note 1: This test is also applicable to high-strength geotextile yarns that are made from PET and are used in reinforcement applications.

    1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    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


    ICS Code

    ICS Number Code 59.080.20 (Yarns)

    UNSPSC Code

    UNSPSC Code 11151700(Yarns); 13111039(Polyethylene terephthalate or glycol modified)


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

    DOI: 10.1520/D7409-15R20

    Citation Format

    ASTM D7409-15(2020), Standard Test Method for Carboxyl End Group Content of Polyethylene Terephthalate (PET) Yarns, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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