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s ~ <br />Elongation at Break The extension of a uniform section of a specimen at rupture <br />expressed as a percent of the original length. <br />Elongation, Percent Fur geosynthetics, the increase in a length of a specimen expressed <br />as a percentage of the original gauge length, i.e., engineering strain. <br />Elongation at Yield The extension of a uniform section of specimen at yield expressed as <br />percent of the original length. <br />Environmental Stress The development of cracks in a material that is subjected to stress or <br />Crack strain in the presence of speciFc chemicals. <br />Extrusion Welded Seams A bond between the two flexible membrane sheets is achieved by <br />heat extruding the hot parent material benveen or over the overlap <br />areas (followed by applied pressure if between the sheets). <br />Film Teaz Bond (FTB) Failure of one of the parts of a peel or ply adhesion test specimen by <br />tearing, instead of separating from the other part of the specimen at <br />the manufactured or formed interface. <br />FTMS <br />Federal Test Method Standard 21 ~-299-5400 <br />High Density Polyethylene A polymer prepared by low-pressure polymerization of ethylene <br />as (HDPE) the principal monomer. <br />Iv[elting Point The temperature at which the solid and liquid states of a substance <br />are in equilibrium; generally, the temperature at which a substance <br />changes from a solid to a liquid. <br />N[odulus of Elasticity The ratio of stress to strain for a material under given loading <br />conditions; numerically equal to the slope of the tangent or the <br />secant of astress-strain curve. The use of the term Modulus of <br />Elasticity is recommended for materials that deform in accordance <br />with Hooke's law; the therm Modulus of Deformation For material <br />that deform otherwise. <br />Moisture Content The percentage by weight of water contained in the pore space of a <br />rock or soil with respect to the weight of the solid material (ISRM). <br />Nets Coarse strand, typically 1 to 5 mm (3/64 to 3/I6 in.) in diameter, <br />obtained by extrusion, are used to make nets. They consist of nvo <br />sets of coarse parallel extruded strands intersecting with a constant <br />angle (generally benveen 60° to 90°). <br />NSF National Sanitation Foundation Standard. 313-769-8010 <br />38 <br />