ASTM D4885 covers the determination of the performance strength of synthetic geomembranes by subjecting wide strips of material to tensile loading. ASTM D4885 covers the measurement of tensile strength and elongation of geomembranes and includes directions for calculating initial modulus, offset modulus, secant modulus, and breaking toughness. ASTM D4885 is a performance test intended as a design aid used to determine the ability of geomembranes to withstand the stresses and strains imposed under design conditions. ASTM D4885 assists the design engineer in comparing several candidate geomembranes under specific test conditions.

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