Geomenbrane Testing

High density polyethylene (HDPE) is commonly used for geomembranes. It has broad chemical resistance and excellent UV resistance, but lacks flexibility and can develop brittle stress cracking at low stresses if not properly formulated. Geomembranes are rolled out with overlapping pieces to enable the joins to be welded.

Type of test / Properties measured / Range of measurement	Standard Specifications
Initial tear resistance	ASTM D 1004
Density by the density - gradient technique	ASTM D 1505
Carbon black content by the mufflefurnace technique	ASTM D 4218
Integrity of field seams - 180° peel strength	ASTM D 4437 ASTM D 413 (Type A)
Integrity of field seams - shear strength	ASTM D 4437 ASTM D 816 (Method B)
Index puncture resistance	ASTM D 4833
Nominal thickness	ASTM D 5199
Calculation of 2% secant modulus for polyethylene geomembranes	ASTM D 5323
Microscopic evaluation of the dispersion of carbon black	ASTM D 5596
Core thickness of textured geomembrane	ASTM D 5994
Tensile properties	ASTM D 6693
Tensile properties	ANSI/NSF Modification Standard 54: Annex A Part 8, based on ASTM D 638, using type IV die
Asperity measurement using a depth gauge	Geosynthetic Research Institute test method GM12

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