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TABLE 2:
SPECIAL PHYSICAL AND MECHANICAL REQUIREMENTS (HDPE GEOMEMBRANES)
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Property
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Characteristic
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Standard Values
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Test methods, Testing Regulations
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8. Performance
under tensile load
8.1
8.2
8.3
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Biaxial tensile test, out-of-plane elongation.
Uniaxial tensile test, yield stress, elongation
at yield, elongation at break at 23°C.
At 70°C.
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Out-of-plane elongation ³15% without yielding of
the material.
The following values must apply at 23°C: yield strength ³15N/mm2, elongation at yield ³10%,
elongation at break ³400%*.
The following values must apply at 70°C: yield strength and elongation at yield:
still to be determined. Stress ³2N/mm2 at 5%
elongation.
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The test is based on DIN 53861, see Appendix
A.
The tensile tests are carried out in accordance
with DIN 53455 with No. 3 samples at a climate of 23/50 and
at 70 ± 2°C
at speed of 50mm/min. The
samples are taken from the edge of the geomembranes along and
across the direction of extrusion.
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9. Tear propagation resistance
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Tear propagation strength.
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Tear propagation strength ³500N.
Tear propagation strength ³300N.
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Testing in accordance with DIN 53356-A.
Testing in accordance with DIN 53515. Samples
taken along and across the direction of extrusion.
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10.
Resistance to punctform quasistatic single loads.
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Penetration strength.
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Penetration strength ³6000N.
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Testing in accordance with DIN 54307 at a punch
speed of 50mm/min.
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