1. Scope

1.1 This guide covers selecting one or more appropriate test methods to assess the permeability of all candidate geomembranes for a proposed specific application to various permeants. The widely different uses of geomembranes as barriers to the transport and migration of different gases, vapors, and liquids under different service conditions require determinations of permeability by test methods that relate to and simulate the service. Geomembranes are nonporous homogeneous materials that are permeable in varying degrees to gases, vapors, and liquids on a molecular scale in a three-step process ( 1 ) by dissolution in or absorption by the geomembrane on the upstream side, ( 2 ) diffusion through the geomembrane, and ( 3 ) desorption on the downstream side of the barrier.

1.2 The rate of transmission of a given chemical species, whether as a single permeant or in mixtures, is driven by its chemical potential or in practical terms by its concentration gradient across the geomembrane. Various methods to assess the permeability of geomembranes to single component permeants, such as individual gases, vapors, and liquids are referenced and briefly described.

1.3 Various test methods for the measurement of permeation and transmission through geomembranes of individual species in complex mixtures such as waste liquids are discussed.

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

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

D471 Test Method for Rubber Property--Effect of Liquids

D814 Test Method for Rubber Property--Vapor Transmission of Volatile Liquids

D815

D1434 Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting

D4439 Terminology for Geosynthetics

D4491 Test Methods for Water Permeability of Geotextiles by Permittivity

E96/E96M Test Methods for Water Vapor Transmission of Materials

F372 Test Method for Water Vapor Transmission Rate of Flexible Barrier Materials Using an Infrared Detection Technique

F739 Test Method for Permeation of Liquids and Gases through Protective Clothing Materials under Conditions of Continuous Contact

Keywords

barriers; diffusion of gases and vapors; flexible membrane liners (FMLs); gas transmission; leachate; organic vapor transmission; permeability; polymeric geomembranes; reservoirs; transport of chemical species; transport of ions; waste disposal; water vapor transmission; Barrier materials/systems; Diffusion (gases/vapors); Flexible membrane liners (FMLs); Ion transport; Leachates/leaching; Organic vapor transmission; Permeability--geosynthetics; Polymeric geomembranes; Reservoirs; Transport of ions; Waste materials/processing/analysis; Water vapor transmission (WVT);

ICS Code

ICS Number Code 13.060.30 (Sewage water); 17.120.01 (Measurement of fluid flow in general)

DOI: 10.1520/D5886-95R06

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