Geomembrane Technical

Geomembrane Technical

Flexible Polyethylene, Baffle Curtains, Vulcanseal

Flexible Polyethylene (Permaflex)

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, irrigation canals and as a damp proof course.


Permaflex is a black flexible polyethylene geomembrane available in .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.


Permaflex FPE is manufactured in  0.5mm, 0.75mm and 1mm thickness. Roll size is 6m x 100m. 



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.


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.

Horticultural pond
Permaflex has a high puncture resistance
Permaflex is sealed with wedge and extrusion welders
Permaflex for baffle curtains

Vulcanseal Geomembrane Tape

Vulcanseal G-25

A single sided tape designed to join geomembrane when used as a damp proof course under concrete and as a repair method for damaged liners, including PVC, flexible polypropylene, polyethylene, woven PE, HDPE.

This tape is designed for permanent joining of membranes under concrete or for temporary repair of lining membranes.

For containment applications always use a wedge welder or other approved method to join liner panels due to possible consolidation of the sub base which may put pressure on the joint.

Vulcanseal G-25 is UV stabilized. It has a single sided adhesive and is applied to an overlapped membrane or directly over a tear. When overlapping allow 75mm with the G-25 placed over the top. It can be used in conjunction with Vulcanseal 609 in damp proof course applications. The 609 being double sided is placed between two layers of geomembrane with the G-25 on top and pressure rolled using a hand roller. See dpc installation guide for additional info.

Adheres to Most Construction Surfaces

Carbon Steel, Galvanised Steel, Aluminium, Fibreglass, Gib Board, Polyethylene, Polypropylene, PVC, Polystyrene, Concrete, Masonry, Wood.

Product Description

Vulcanseal G-25 Super Seal is composed of a tough, specially formulated multipolymer film 

“MAF” with a synthetic elastomeric adhesive. This adhesive is kept from permanently bonding to its backing (while in the roll) by a tough, easily removed polymer release liner which prevents contamination of the adhesive prior to its use.

Basic Use

Liner and tarpaulin repair

Vulcanseal G-25 is suitable for repairs of holes and small tears in most materials including PVC, Polypropylene, HDPE, LDPE. G-25 is UV and water resistant. 

General repairs for most materials

G-25 will provide an instant and watertight seal on truck bodies, trailers, etc made from wood, fibreglass, steel, aluminium.

Surface Preparation

Surface must be clean and dry; free from loose rust, dust, dirt, oil, grease and other contaminants. Use a solvent or other cleaner if necessary.

Tape Application

Vulcanseal G-25 Super Seal is applied by removing the release liner and pressing the adhesive to the clean and dry joint area. Tension in wrapping should be enough to obtain conformability to the surface being coated.

Vulcanseal 609

Vulcanseal 609 is a black, polyisobutylene, moisture and vapour resistant, doublesided, pressure sensitive adhesive. It is made of isobutylene-isoprene rubber with a non-stretching integrated rayon scrim (woven cellulose acetate yarn) reinforcement backed with a silicon coated paper release medium. The tape is non-toxic, non-corrosive, and resistant to UV and a range of chemicals. Vulcanseal 609 is UV resistant. When used in approved applications, the product is not known to degrade.

Basic Use 

Vulcanseal adhesive is for sealing and joining of impervious membranes such as polyethylene, polypropylene and PVC. It may be used for bonding membranes to approved substrates. Vulcanseal adhesive fills cracks in composite type roofing and metal materials such as pipes, gutters, water tanks, skylights and domes.

Note: Vulcanseal is suitable for sealing lining materials that are not used for containment, for example as a damp proof course when used in conjunction with Vulcanseal G-25 a water tight seal should be achieved. For containment liners or critical lining applications in very damp areas we strongly recommend the lining be heat sealed with suitable machinery.


Vulcanseal 609 is applied by removing the release liner and pressing the adhesive to the clean and dry joint area. Tension in wrapping should be enough to obtain conformability to the surface being coated.

When using Vulcanseal 609 to seal membrane liners a rubber roller should be used. 

See additional instructions under “Concrete Underlay Installation” in the Permathene Geomembrane catalogue. 

Vulcanseal G-25 Single Sided geomembrane repair tape
Vulcanseal 609 polyisobutylene double sided tape