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ASTM D5323-19a

Current Revision

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

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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.


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.

SDO ASTM: ASTM International
Document Number D5323
Publication Date Feb. 1, 2019
Language en - English
Page Count 4
Revision Level 19a
Supercedes
Committee D35.10
Publish Date Document Id Type View
Feb. 1, 2019 D5323-19A Revision
Jan. 15, 2019 D5323-19 Revision
May 1, 2023 D5323-19AR23 Reaffirmation
July 1, 2018 D5323-92R18 Reaffirmation
June 1, 2011 D5323-92R11 Reaffirmation
Jan. 1, 2006 D5323-92R06 Reaffirmation
Jan. 10, 1999 D5323-92R99 Reaffirmation