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    ASTM D5323 - 19a

    Standard Practice for Determination of 2 % Secant Modulus for Polyethylene Geomembranes

    Active Standard ASTM D5323 | Developed by Subcommittee: D35.10

    Book of Standards Volume: 04.13

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    Significance and Use

    4.1 Where to draw the tangent to determine the modulus of elasticity is often unclear when performing tensile tests with polyethylene geomembranes. This problem results in a wide variation in test results and, therefore, makes this property unreliable for comparisons.

    4.2 A secant modulus based on 2 % strain can be useful when making comparisons between materials, in quality control, and in comparing the same sample after being subjected to a nonstandard environment.

    4.3 Secant modulus is an approximation of modulus of elasticity and generally results in a lower value than that for the modulus of elasticity.

    4.4 Although the technique for measuring 2 % secant modulus is described here, other percent secant moduli can be measured by this practice.

    1. Scope

    1.1 This practice presents a technique for calculating the 2 % secant modulus for polyethylene geomembranes between 0.5 and 5 mm (20 and 200 mil) using Test Method D6693/D6693M.

    1.2 This practice will facilitate modulus comparisons of similar materials by standardizing the method for deriving the points on the stress-strain curve from which the calculations are performed.

    1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

    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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.5 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

    D883 Terminology Relating to Plastics

    D4439 Terminology for Geosynthetics

    D6693/D6693M Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced Flexible Polypropylene Geomembranes

    ICS Code

    ICS Number Code 59.080.70 (Geotextiles)

    UNSPSC Code

    UNSPSC Code 13111016(Polyethylene); 30121702(Geotextile)

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

    DOI: 10.1520/D5323-19A

    Citation Format

    ASTM D5323-19a, Standard Practice for Determination of 2 % Secant Modulus for Polyethylene Geomembranes, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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