Geomembrane & Geotextiles

/Geomembrane & Geotextiles
Geomembrane & Geotextiles2018-09-14T01:32:51+00:00

Geomembrane

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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.

Wide Temperature Range

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.

    • 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.

Permathene Pty Ltd (Australia) supplies only.

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.

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 brochure and installation guide

Geotextiles

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Geotextiles are a geosynthetic material used for applications civil including drainage, reinforcement of soils, separation of gravel and soil, environmental applications including de-watering of contaminated liquids, geomembrane protection.

The types of geotextiles are woven and nonwoven. Drainage applications would typically use a nonwoven due to their ability to filter without clogging and unpaved roads normally use a woven geotextile.

Nonwoven Geotextile

Nonwoven polypropylene (PP) geotextiles are made from needle punched polypropylene staple fibre. These fibers are cut, opened, laid onto a web, needled, inspected, tested and rolled. The production technique produces a product described typically as “a nonwoven needle punched geotextile”.

Buy Nonwoven Geotextiles

Roadway stabilisation/ separation 

Roads and highways are built using geotextile to prevent aggregate from mixing with the subgrade and to strengthen the soil, reducing pot holes

Drainage

Syntex nonwoven geotextiles are ideal for drainage applications. Unlike woven geotextiles (with the exception of monofilament drainage fabrics), polypropylene nonwovens resist clogging. Nonwovens are placed in direct contact with the earth where drainage stone, perforated drain coil, etc may be placed. The nonwoven filters soil and waste while allowing water and leachate to pass.

Nonwoven geotextile

Nonwoven properties

Geomembrane Protection

Syntex heavy weight nonwoven geotextiles will cushion and protect geomembranes from puncture caused by aggregate and basecourse. Gas Venting: Heavy weight nonwoven geotextiles are used for collection and lateral transmission of liquids and gases that may build up under a geomembrane used in a capping of waste facility.

Hard amour underlay

Syntex nonwoven geotextiles are recommended to help relieve hydrostatic pressure beneath hard armour and prevent soils from migrating to the surface providing an effective erosion control method.

Mudstop Woven Geotextile

Woven geotextiles are manufactured by extruding polypropylene film and then slitting the film into individual yarns which are then woven to form the geotextile.

Mudstop woven geotextiles provide a stable base for unpaved roads. The fabric prevents subsoil mixing with aggregate which, without geotextile, will quickly require repair. Not only will the soil migrate to the surface but also deep ruts will occur causing greater repair costs.

Buy Mudstop

Mudstop woven geotextiles also provide stabilisation over soft ground. Where access roads become boggy due to vehicles and poor weather, a woven geotextile can provide the needed foundation by spreading the load across a wide area.

Mudstop is a permeable, woven polypropylene geotextile designed for applications where soil stabilisation and separation are major functions and strength is not critical.

When used and installed correctly the fabric may be used as follows:

  • Separation of aggregates in parking, pavements, and roads
  • Low cost temporary or permanent roading for construction vehicles in problem traffic areas
  • Under aggregate to prevent loss of fill into subsoil and allow top cover to remain firm
  • Filter lining for erosion control and stop banks

Availability

155gsm: 4m x 5m, 4m x 150m
110gsm: 3.81m x 10m

Silt Fence

Buy Silt Fence

Syntex Silt Fence is available in two styles, Super silt Fence and Standard silt fence. Super silt fence is manufactured in a folded 2.6m x 50m roll. It meets or exceeds all requirements of TP 90 for the super silt fence specification. Standard silt fence is a high quality woven mesh designed to capture sediments from construction site runoff. It is UV stabilised. Size: 1m x 50m.

Syntex Silt Fence is a 95gsm woven silt fence manufactured from master batch UV stabilized polypropylene (non-recycled) with a 96 x 44 /10cm weave. Tensile strength is 18kN MD, 11kN CD. Permeability is a minimum of 10 L/m2/sec (EN ISO 11058). Opening size is 0.2mm (EN ISO 12956).

Applications

Silt Fence is used to help prevent contaminants from sediments entering streams, lakes, coastal waters. Construction run-off into drainage systems can severely impact New Zealand’s ecology unless contained. Silt Fence is only part of the solution.

Installation

The preferred method of installation is to trench the material using a silt fence trenching machine. In absence of the proper machinery several other methods are used. Silt fences must be installed to prevent run-off from passing around them, ends should be installed up slope.

A trench is constructed, to a width of 100mm x 200mm depth, minimum. Proper installation requires the Silt Fence be anchored in the trench preferably with the fabric covering the bottom of the trench. Backfill using earth moving equipment, followed by compacting.

Stakes should be either tanalised timber of 50mm square or steel star stakes of 1.5m length. Drive the stakes into the ground to a minimum depth of 400mm, or 600mm on a slope of 3:1 or greater.

Spacing of stakes is at a minimum distance of 2m apart. Always install the silt fence with the stakes behind the flow.

Support fence is recommended to be installed along the entire length along the upslope side of the fence from the top to the bottom of the silt fence. A support wire (2.5mm galvanised) is attached along the top of the fence.