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DuraForce® AS Geotextile

DuraForce® AS series geotextile is manufactured and tested to exact quality standards and rated according to the NZTA F/7 specification for geotextiles.

There is an extensive range of geotextiles available. Due to the process by which they are manufactured, different performance capabilities can be achieved. Frequently there will be a secondary function required of the geotextile as well as the primary function, e.g. drainage as the primary function and separation as the secondary.

Non-woven needle-punched geotextiles are manufactured from the extrusion of fibres which are laid down on a manufacturing ‘bed’ and then needle punched. This manufacturing process allows for the use of nonwoven geotextiles in applications of drainage, filtration and protection.


Frequently Asked Questions

  • Filtration, separation and reinforcement.
  • Needle punched is preferable for filtration, and woven is tougher for reinforcement.
  • Both will effectively separate soil layers.

Some geotextiles appear thinner than other brands for the same strength class owing to the manufacturing process. If the textile is needled punched further, to get effective interlock of the fibres, it can appear thinner for the same mass and strength. If a geotextile of the same weight appears thicker and fluffier the difference is probably only fresh air, and who wants to pay for fresh air?

As a separation layer between two matierials e.g clay base and GAP40. This will prevent the two materials mixing which wastes expensive aggregate.

For reinforcing/strengthening the ground. This will ensure your surface is more stable for years to come. Particularly useful with peat/unstable clay ground conditions.

For filtration as the geotextile allows the displacement of water across the relevant area.

Woven geotextiles are usually compared by tensile strength which we read on the data sheet. Nonwoven needle punched geotextiles are usually graded according to the NZTA specification F/7. For heavier grades which are not in the F/7 specification comparison is most commonly by fabric weight in grams/m² or tensile strength.

NZTA F/7 gives guidance on overlap of geotextiles, which is dependent on the strength of the subgrade. The minimum recommended overlap is 300mm.

Benefits & Features





13649 DuraForce AS240 1.9m x 50m (95m²)
13888 DuraForce AS240 3.9m x 50m (195m²)
13820 DuraForce AS240 4m x 100m (400m²)
76339 DuraForce AS240 6m x 100m (600m²)
13650 DuraForce AS280 1.9m x 50m (95m²)
13889 DuraForce AS280 3.9m x 50m (195m²)
13415 DuraForce AS280 4m x 100m (400m²)
76342 DuraForce AS280 6m x 100m (600m²)




13913 DuraForce AS410 1.9m x 50m (95m²)
13914 DuraForce AS410 3.9m x 50m (195m²)
13821 DuraForce AS410 4m x 100m (400m²)
76345 DuraForce AS410 6m x 100m (600m²)
13368 DuraForce AS440 4m x 100m (400m²)
13439 DuraForce AS440 6m x 100m (600m²)
13651 DuraForce AS640 4m x 75m (300m²)
13661 DuraForce AS640 6m x 75m (450m²)

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Please note:

Cirtex stocks the Triton S22 Chambers. When using the calculator, please ensure you change 'chamber selection' to S-22.

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