Geomembrane

/Geomembrane
Geomembrane 2017-11-19T19:36:58+00:00
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Geomembrane describes a range of geosynthetic materials used for lining and containment applications. From landfill liners to fish ponds, geomembrane is available in different styles and grades to meet the requirements of the project.

Permaliner Flexible Polypropylene (FPP)

Permaliner FPP is a black, high specification geomembrane manufactured with optimum chemical and physical stability. Manufactured from polypropylene, Permaliner has excellent flexibility over a wide temperature range, maintaining resistance to tear, puncture and weld seam damage. The wide temperature range (- 40° C to 80° C) allows for many applications not suitable to other materials.

Flexible Polypropylene has the lowest density of any of the geomembrane materials providing for easier deployment of panels as well as the significant benefit of having one of the lowest water transmission rates of any of the common geomembrane materials. This makes FPP one of the most suitable waterproofing membranes available. Permaliner has excellent UV resistance and retains flexibility even under extreme fully exposed weathering conditions. A 2.5% concentration of finest quality carbon with 97.15% polymer provides maximum protection against photochemical attack.

Permaliner FPP has a very high ESCR (Environmental Stress Cracking Resistance). ESC is promoted by such factors as chemicals, UV, temperature changes and ground settlement. The long-term flexibility and UV resistance is one of key reasons Permaliner is easily repaired if damaged, plus it has an extremely low co-efficient of linear thermal expansion (CLTE) to help prevent welded seam stress. Note: Permaliner FPP has superior dimensional stability with a CLTE half that of HDPE and LLDPE. The excellent puncture resistance of Permaliner FPP out performs other materials including LDPE and LLDPE.

Permaliner FPP has a very high ESCR (Environmental Stress Cracking Resistance). ESC is promoted by such factors as chemicals, UV, temperature changes and ground settlement. The long-term flexibility and UV resistance is one of key reasons Permaliner is easily repaired if damaged, plus it has an extremely low co-efficient of linear thermal expansion (CLTE) to help prevent welded seam stress. Note: Permaliner FPP has superior dimensional stability with a CLTE half that of HDPE and LLDPE. The excellent puncture resistance of Permaliner FPP out performs other materials including LDPE and LLDPE.

    • Containment. Primary and secondary containment lining for a variety of applications including tank, pond and canal for potable water, fish breeding in fresh or salt water, horticultural, decorative ponds, lining of earth dams, sediment ponds. Also suitable for lining effluent ponds for dairy and pigs (also floating covers for odour control) and waste containment.
    • Lining. Suitable as methane gas barrier where specified as a one-piece membrane, with all panels welded and placed under concrete, or alternatively taped.

Permaliner is a food and drinking water grade material (AS/NZS 4020:2005, FDA § 177.1210) with an excellent balance of chemical and UV resistance. It is 100% free of plasticisers, fillers, lubricants and other toxic stabilisers. This makes Permaliner ideal lining for tanks, reservoirs, horticultural and agricultural ponds and lakes.

Potable Water

Permaliner FPP (all grades) has been certified to meet AS/NZS 4020:2005 for use in contact with drinking water.
  • Taste of Water Extract: Passed
  • Appearance of Water Extract: Passed
  • Growth of Aquatic Micro-organisms: Passed
  • Cytotoxic Activity of Water Extract: Passed
  • Mutagenic Activity of Water Extract: Passed
  • Extraction of Metals: Passed

Note: Testing at 20 degrees Celcius (+/- 2 degrees), at an exposure of 15000 mm2 per litre.

Permaliner FPP

Permaliner projects

Permaflex Flexible Polyethylene (FPE)

Permaflex Flexible Polyethylene (FPE) is a new generation multi layer geomembrane. It is manufactured with high resistance to base chemicals and chlorine. With slightly less flexibility than flexible polypropylene it still maintains the ability to flex where needed unlike HDPE which is stiff by nature.

Permaflex FPE is recommended for use to line tanks, including timber tanks, concrete and metal tanks. It is suitable for fish farms, liquid storage and as secondary lining. Permaflex FPE is also widely used for artificial lakes and irrigation canals.

Advantages

Permaflex is a black flexible polyethylene geomembrane available in .3mm, .5mm, .75mm and 1mm thickness. It is the preferred alternative to PVC and polypropylene for tank liners as is not easily affected by chlorine. It is highly flexible and easily forms around corners. Suitable for ponds, reservoirs and liquid storage. Excellent UV resistance.

Availability

Permaflex FPE is manufactured in 4 grades, 0.3mm, 0.5mm, 0.75mm and 1mm thickness. Roll size is 6m x 100m or 8m x 100m. Permathene can supply the material to fabricators in roll form or we can manufacture to specific sizes in our Auckland factory. We are able to manufacture single panels which are folded or rolled ready to be deployed on site.

    • Containment. Primary and secondary containment lining for a variety of applications including tank, pond and canal for potable water, fish breeding in fresh or salt water, horticultural, decorative ponds, lining of earth dams, sediment ponds. Also suitable for lining effluent ponds for dairy and pigs (also floating covers for odour control) and waste containment.
    • Lining. Suitable as methane gas barrier where specified as a one-piece membrane, with all panels welded and placed under concrete, or alternatively taped.

Permaflex is a food and drinking water grade material (AS/NZS 4020:2005, FDA § 177.1210) with an excellent balance of chemical and UV resistance. It is 100% free of plasticisers, fillers, lubricants and other toxic stabilisers. This makes Permaflex ideal lining for tanks, reservoirs, horticultural and agricultural ponds and lakes.

Potable Water

Permaflex FPE (all grades) has been certified to meet AS/NZS 4020:2005 for use in contact with drinking water.
  • Taste of Water Extract: Passed
  • Appearance of Water Extract: Passed
  • Growth of Aquatic Micro-organisms: Passed
  • Cytotoxic Activity of Water Extract: Passed
  • Mutagenic Activity of Water Extract: Passed
  • Extraction of Metals: Passed

Note: Testing at 20 degrees Celcius (+/- 2 degrees), at an exposure of 15000 mm2 per litre.

Permaflex FPE

High Density Polyethylene (HDPE)

HDPE is produced on state-of-the-art 3 layer extruders to 7.0 m and 8.0 m wide rolls to ISO 9001. The product is available in smooth ranging in thickness from 0.5 mm to 2.5 mm, and textured ranging in thickness from 1 mm to 2.5 mm. The material is manufactured to strict specifications with all testing in accordance with ASTM and GSI standards.

Applications

  • Mining. An HDPE geomembrane can prevent contamination of water and soil by providing a highly resistant barrier to chemicals produced during the extraction of precious metals.
  • Landfills. Highly resistant to hazardous chemicals HDPE has long been the lining of choice for this application. Used as either primary or secondary containment/ caps with or without GCL.
  • Irrigation Canals. To prevent water loss from seepage of water for man-made canals.
  • Tank Liners. Steel and concrete tanks are easily lined to prevent seepage loss. Also used as secondary lining under tanks in the petrochemical industries.

Installation

Hot Wedge Welding

The primary method for sealing HDPE is on-site by fusion using a portable hot wedge welder. The wedge melts the overlapped surfaces between pressure rollers. This produces a permanent homogeneous seam with an air channel which allows for pressure testing. During testing a successful weld is stronger than the material (the sample material will break before the weld peels apart).

Extrusion Welding

This is used for repairs and detail work such as pipe boots and protrusions. We use copper wire in our extrusion welds to reduce the possibility of defects for spark testing.

Quality

Although studies have proven that geomembrane failure is caused primarily during the covering stage from earth moving equipment, trucks, etc, an unacceptably high number (almost 20%) of failure is caused by poor workmanship during the welding stage.

We can provide geotechnical engineers to assist designers during any stage and to ensure all QA/QC is completed in accordance with specification as well as to monitor our own ISO 9001, 14001 Standards.

Permathene installation crews pay particular attention to detail and follow proven methods to ensure long-term success of the geomembrane liner. Foremost in any successful geomembrane installation is good design. Success of any lining system is dependent upon this.

Manufactured and tested to conform with GRI GM13.

HDPE

HDPE projects

Dampstop Multi Layer (ML)

Dampstop ML is a multi layered flexible polyethylene with excellent tensile strength, puncture resistance and chemical resistance. The product is supplied in roll form with 4 folds for easy deployment on-site.

Dampstop ML can be either heat sealed using a wedge welder or overlapped and taped using Vulcanseal G-25 tapes, or standard PE/ PVC sealing tapes.

Scope

Dampstop ML is recommended as superior damp proofing membrane. When used in accordance with installation instructions it may be used as follows: under concrete slabs at grade or below grade level; lining against earth fill for retaining walls and basement walls; under foundation footings and grade beams; vapour barrier retarder lining; roof deck underlay; crawl space lining.

Durability

Dampstop ML has a minimum life of 50 years and an expected indefinite lifespan under the following conditions:

  • Free from tear, puncture or damage during installation
  • Storage away from direct sunlight prior to installation
  • No exposure to corrosive or petrochemical agents
  • The concrete remains unbroken
  • The building maintaining structural integrity

Availability

Dampstop ML is available as: Custom: A single continuous sheet fabricated to required size and shape with all joints factory heat sealed. Rolls: 6m x 100m. Dampstop ML can be sealed to concrete footings and protrusions using Vulcanseal tapes.

Dampstop ML