B. Geomembrane Specifications
1. The Geomembrane Manufacturer shall deliver Geomembrane that is in
conformance with the specifications below.
Property Test Method Value
Thickness (min. ave.): 40 mil
Lowest individual reading (-10%) ASTM D5994 34 mil
Asperity Height (min. ave.) ASTM D7466 16 mil
; ASTM D1505_ or
Formulated Density 2 0.94 g/cc
D792
Tensile strength (min. ave.) @)
Yield strength 84 lb/in. width
Break strength ASTM D6693 60 lb/in. width
Yield elongation 12 percent
Break elongation 100 percent
Tear resistance (min. ave.) ASTM D1004 28 lbs
Puncture resistance (min. ave.) ASTM D4833 60 lbs
Stress Crack Resistance (min. ave.) ®) ASTM D5397 > 500 hours
Carbon Black Content (range) ASTM D4218 2 to 3 percent
Carbon Black Dispersion ASTM D5596 (C)
Oxidative Induction Time (min. ave.) ASTM D3895 2 100 minutes
Notes:
A. Test in Machine direction and cross machine direction. The average values should be based on 5
test specimens each direction.
= Yield elongation is calculated using a gage length of 1.3 inches.
=" Break elongation is calculated using a gage length of 2.0 inches.
B. This test is not appropriate for testing geomembranes with textured or irregular rough surfaces.
The test should be conducted on smooth edges of textured rolls or on smooth sheets made from
the same formulation as being used for the textured sheet materials. The yield stress used to
calculate the applied load for the test should be the manufacturer’s mean value obtained from the
manufacturer’s quality control testing of the same sample.
C. Carbon black dispersion (only near spherical agglomerates) for 10 different views:
=" 9in Categories 1 or 2; and
= lin Category 3.
2. The Geomembrane shall contain a minimum of 2 percent but not more than
3 percent carbon black according to ASTM D1603, and have a carbon black
dispersion rating of Category 1 or Category 2 according to ASTM D5596.
3. The Geomembrane shall consist of unreinforced HDPE containing 3
percent by weight maximum additives, fillers, or extenders, including
carbon black.
4. The Geomembrane shall have no striations, pinholes, or bubbles and shall
be free of holes, blisters, undispersed raw materials, or any sign of
File No. 3066.21 Geomembrane 02550 - 4 of 10 January 2021
