Geomembrane

Geomembranes – 1.0 – 4.0 mm thick roll polymer sheets made of a high density (HDPE) and linear low density (LLDPE) polyethylene; polypropylene (РР), polyvinylchloride (PVC), and other materials 0.5–4 mm thick and with 7 m and over width; their main operating characteristics is imperviousity.

Modern geomembranes based on polyethylene of high (HDPE) and linear low (LLDPE) density have a smooth and textured surface. They are characterized by imperviousity and chemical resistance; and have perfect physical-mechanical properties. First al all if in contact with fluids diffusion is observed only at the molecular level.

Geomembranes are resistant to most chemicals (рН from 0.5 to 14), and have such properties as flexibility, shrink-resistance and crack-resistance (maximum relative elongation at break of up to 850%; high tensile strength – up to 26.2MPa). Resistance to UV exposure and temperature fluctuation, together with a high puncture resistance and seismic resistance can ensure a widest range of application of polyethylene geomembranes in all climatic zones. If professionally installed geomembrane structures can serve minimum 90 years.

Rigorous standardization in the manufacture of geomembranes is an exclusive feature of this class of materials. All manufacturers of polyethylene geomembranes are obliged to follow the uniform industry specifications developed by the Geosynthetics Research Institute – GRI GM13 for HDPE geomembranes and GM17 for LDPE geomembranes (LDPE, VFPE). Thus, the term “geomembrane” refers not merely to polyethylene film, but to a product with a full set of specific engineering characteristics.

  • GRI-GM 13 (Test Methods, Test Properties and Testing Frequency for High Density Polyethylene (HDPE) Smooth and Textured Geomembranes).
  • GRI-GM 17 (Test Methods, Test Properties and Testing Frequency for Linear Low Density Polyethylene (LLDPE) Smooth and Textured Geomembranes).
  • GRI-GM 19 (Seam Strength & Related Properties of Thermally Bonded Polyolefin Geomembranes)

SOLMAX Geomembrane (HDPE)

HDPE (high-density polyethylene) is the most chemically resistant member of the polyethylene family on account of its dense configuration.  It is extensively used as impervious screens for hydraulic structures – landfills for liquid and solid industrial waste (including hazardous wastes), landfills for solid municipal waste, manure storage pits, artificial water reservoirs, as a waterproof liner for concrete, metal and other surfaces, as well as in potable water reservoirs.

Technical parameters (HDPE):

Specifications Test method Solmax 840 Solmax 860 Solmax 880
Thickness (minimum average),mm ASTM D5199
GOST 17035-86
1.00 1.5 2.00
Standard roll dimensions, m 6.8 x 238 6.8 x 159 6.8 х 122
Raw material density, g/cm3 ASTM D1505 > 0.926 > 0.926 > 0.926
Density, g/cm3 ASTM D1505
GOST 2678-94
> 0.940 > 0.940 > 0.940
Melt index ASTM D1238 (E) <1.0 <1.0 <1.0
Carbon black content, % ASTM D4218 2.0-3.0 2.0-3.0 2.0-3.0
Tensile stress at 13% elongation, kN/m ASTM D638 (4)
GOST 2678-94
14.7 22.0 29.0
Strength at break, Elongation at break ASTM D638 (4)
GOST 2678-94
27.0 kN/m
700%
40.0 kN/m
700%
53.0 kN/m
700%
Dynamic Perforation strength, N ASTM D4833
GOST 2678-94
320 480 640
Water permeability GOST 2678-94 0 0 0
Vapor permeability GOST 21472-81 0 0 0
Chemical resistance GOST 12020-72 ph 0.5–ph 13 ph 0.5–ph 13 ph 0.5–ph 13
Low temperature resistance, °C GOST 2678-94 -60 -60 -60
UV Resistance – % retained after 1600 hr HP OIT GRI-GM11 50 50 50

“SOLMAX” HDPE geomembrane  with textured surface is also available – Textured HDPE geomembrane (thickness 1,0 – 2,0 mm, texture height 0,25 mm).

SOLMAX Geomembrane (LLDPE)

Low-density polyethylene (LLDPE) Geomembranes are very flexible material successfully used during construction in collapsing soils and in complicated structures such as underground storage tanks containment.

Technical parameters (LLDPE)

Specifications Test method Solmax 840 Solmax 860 Solmax 880
Thickness (minimum average),mm ASTM D5199
GOST 17035-86
1.00 1.5 2.00
Standard roll dimensions, m 6.8 x 238 6.8 x 159 6.8 х 122
Raw material density, g/cm3 ASTM D1505 > 0.926 > 0.926 > 0.926
Density, g/cm3 ASTM D1505
GOST 2678-94
> 0.939 > 0.939 > 0.939
Melt index ASTM D1238 (E) <1.0 <1.0 <1.0
Carbon black content, % ASTM D4218 2.0-3.0 2.0-3.0 2.0-3.0
Tensile stress at 13% elongation, kN/m ASTM D638 (4)
GOST 2678-94
14.7 22.0 29.0
Strength at break, Elongation at break ASTM D638 (4)
GOST 2678-94
27.0 kN/m
800%
40.0 kN/m
800%
53.0 kN/m
800%
Dynamic Perforation strength, N ASTM D4833
GOST 2678-94
250 370 500
Water permeability GOST 2678-94 0 0 0
Vapor permeability GOST 21472-81 0 0 0
Chemical resistance GOST 12020-72 ph 0.5–ph 13 ph 0.5–ph 13 ph 0.5–ph 13
Low temperature resistance, °C GOST 2678-94 -60 -60 -60
UV Resistance – % retained after 1600 hr HP OIT GRI-GM11 50 50 50

“SOLMAX” LLDPE geomembrane  with textured surface is also available – Textured LLDPE geomembrane (thickness of 1,0 – 2,0 mm, texture height 0,25 mm).

HDPE and LLDPE Geomembranes with the given characteristics are manufactured by SOLMAX International Inc. (Canada) in compliance with international quality standards of production and installation of geomembranes developed by the Geosynthetics Research Institute and Drexel University (USA), namely GRI-GM13 for HDPE geomembranes and GRI-GM17 for LLDPE geomembranes, and according to TS 5774-002-39504194-97 (rev. 1, 2- 2005) “Waterproof Polymer Roll Geomembrane”.

APPLICATION OF HDPE AND LLDPE GEOMEMBRANES:

  • Solid domestic and industrial waste landfills;
  • Hazardous waste landfills, including toxic waste;
  • Lining of industrial effluent plants, waste water treatment lagoons, sludge beds, etc.;
  • Agricultural pond Liners;
  • Impervious square screens of tanks for bulk cargoes;
  • Artificial reservoirs – ponds for firefighting purposes and landscape impoundments, fish breeding ponds, irrigation canals and so forth;
  • Potable water reservoirs waterproofing and anti-corrosive coating;
  • Waterproofing of underground structures – basements, multilevel underground parking areas and tunnels;
  • Roads and bridges lining.

MAIN ADVANTAGES OF HDPE AND LLDPE GEOMEMBRANES USE:

  • Operational Flexibility. Field of use of each type geosynthetics and their combinations is extensively wide. Operational properties of geomembranes ensure they are demanded when designing and constructing of various waste landfills and structures within industrial facilities. Geomembranes are used in hydraulic engineering and landscape design – in waterproofing of tunnels, canals, and artificial reservoirs, in soil barriers construction, and for land development. As well as at civil engineering sites, and water preparation and water treatment facilities.
  • Cost effectiveness. Use of geosynthetics reduces construction and operational costs. Regardless of the field of application use of geosynthetics ensures earth works and an imported material use reduction, and allows project completion in shortest time. Physical-chemical parameters of geomembrane ensure increase of the facilities’ lifetime.
  • One of the advantages of geomembrane is its high-degree of technical efficiency. The width of a geomembrane roll measures 6-7 m, which reduces the need for thermoform seams by semi-automatic welding equipment and dramatically cuts the number of extrusion welds made by hand at the seams. Standardized geomembranes have outstanding welding properties, resulting in assembly cost-savings – high welding speeds and the ability to arrange for the quality installation of up to 12,000 m2 per day.
  • Efficiency. One of the principal characteristics of the geomembranes is the elaborated procedure of stepwise material and works quality assessment, which includes certification of the materials used for geomembranes production, examination of the each roll’s mechanical performances, completing with instrumental testing at the construction site and welding seams certification.
  • Environmentally safe. At the moment geosyntetic materials application is the most common technology in environmental facilities construction. First, geomembranes are the environmentally safe material. Secondly, based on their technical parameters modern geomembranes ensure durable impervious structure, providing long term confinement of hazardous materials and preventing their permeation and diffusion in the environment.

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