.100"

Geo-Form Geomembrane Specifications:

Smooth both sides - No asperity height

Traditional Geomembrane Considerations:

One common HDPE specification is .060" with an asperity height of .020", thus core thickness is .040"

1.19 g/cc

Geo-Form Geomembrane Specifications:

Heavier than water - .6 pounds/square foot

Traditional Geomembrane Consdierations:

Density of thermoplastic geomembranes is less than 1.0 g/cc. Ballast may be required.

92

Geo-Form Geomembrane Specifications:

Did not change after 10 years of exposure.

55%

Geo-Form Geomembrane Specifications:

Test for the property of ductility.

Traditional Geomembrane Consdierations:

High strength or reinforced geomembranes are not ductile, thus will not be subjected to this test.

Very Low

Geo-Form Geomembrane Specifications:

Observations of installations over a ten year period have revealed little change as a result of temperature extremes or polymer elasticity.

Traditional Geomembrane Consdierations:

High strength geomembranes require strict installation guidelines to avoid failures caused by shrinkage, expansion, and cold shock.

Yes

Geo-Form Geomembrane Specifications:

Easily and securely welded at 10' / minute and at temperatures below 10 degrees F.

Traditional Geomembrane Consdierations:

Pure thermoset geomembranes cannot be heat welded. HDPE welding has strict limits on ambient temperature and humidity, welding procedures, and critical quality requirements.

20 to 30 Years

Geo-Form Geomembrane Specifications:

Passed ASTM D 1149-07 Aging/Ozone resistance.

10% loss of tensile strength after 10 years of exposure in the desert climate.

Fact: Geomembrane thickness increases aging life.

Primary polymer EDPM is known to have ≥ 30 years of life expectancy.

Suggested Wording for Engineers when Specifying Geo-Form Geomembrane:

“Ductile and heat weldable EPDM Rubber Alloy. Multi-axial elongation must exceed 50%.  Minimum of ten years proven performance and include 20-year limited warranty.”