Filtration
Retain the base soil while allowing controlled water movement. Selection starts with soil grading, apparent opening size and hydraulic demand.
Wholesale project-direct geosynthetic supply · AustraliaTechnical selection · Container-scale project orders
KNP Series · PET continuous filament
Nonwoven geotextiles. Selected around the site.
Needle-punched PET geotextiles for filtration, separation and geomembrane protection—supported by application-led grade selection, broken-needle controls and project-direct supply.
Published ISO and ASTM properties. Custom roll formats and mixed grade containers available by production confirmation.
9–54 kN/mPublished tensile-strength range
1.6–8.6 kNCBR puncture-strength range
70%Retained after 500 h UV exposure
2–6 mWidths plus project roll-length options
Function before grade
One fabric family. Four different design jobs.
The right starting grade changes with the failure mechanism. Filtration is governed by soil compatibility; separation by installation survivability; protection by the stress and deformation at the liner interface.
Separation
Limit intermixing between imported aggregate and the subgrade through construction and service, particularly where fines, water and trafficking interact.
Protection
Distribute localised contact stress and reduce strain imposed on adjacent geomembranes by angular support materials and construction activity.
Drainage interfaces
Provide a stable filter boundary around drainage aggregate, pipework and geocomposites without treating one generic opening size as suitable for every soil.
Preliminary grade screen
Start with the application.
Select the primary function to see the usual Kontain starting range and the project inputs that change the answer.
Screening only.Final selection requires the project specification, soil or aggregate, placement method, loading and exposure conditions.
Balance survivability with filtrationTypical starting range
Civil separation
KNP-12 to KNP-25For roads, platforms, access tracks and earthworks where aggregate intermixing or loss of formation material must be controlled.
01Subgrade condition and CBR
02Aggregate size and angularity
03Construction plant and lift thickness
04Wet-season and pumping risk
Engineering noteUse the installation condition, not only the permanent service condition, to set the starting grade.
Filtration and drainage
Hydraulic compatibility first.
A higher-strength grade does not automatically provide the right filter. Confirm retained-soil grading, opening size, permittivity, flow direction and clogging risk.
- Trench and subsoil drains
- Drainage aggregate wrapping
- Filter interfaces at geocomposites
Geomembrane protection
Reduce localised strain, not just puncture.
Cushion selection should consider particle geometry, applied pressure, liner type, support condition, placement energy and long-term deformation—not one index number in isolation.
- Ponds, dams and process-water liners
- Landfill and containment systems
- Coarse support or cover materials
Standard production control
Needle-punched. Controlled for broken needle fragments.
Residual metal fragments are a preventable risk where geotextile contacts a geomembrane. Kontain-supplied KNP production includes staged magnetic recovery, incident quarantine and 100% finished-roll tunnel metal detection as a standard control.
Why it mattersA small metallic fragment can create a concentrated point load and compromise the protection layer it is meant to provide.
- 01Full-width magnetic recovery
An in-line permanent magnetic roller recovers detached ferrous needle components across the fabric width.
- 02In-process manual scanning
Both surfaces are scanned with a magnetic recovery bar at intervals not exceeding 30 minutes.
- 03100% finished-roll detection
Every roll passes through a tunnel detector, verified with a 1.0 mm ferrous test piece before release.
- 04Quarantine and traceability
Triggered material is isolated, rewound, magnetically recovered and re-inspected; persistent contamination is removed and rejected.
UV RETENTION70%
after 500 hours
ASTM D7238
Exposure management
UV resistance is important. Installation planning still matters.
The published retention value provides a consistent laboratory comparison; it is not a direct conversion to allowable weeks or months on an Australian site. Keep rolls protected, secure deployed fabric and sequence cover placement to minimise unnecessary exposure.
01
Store wrapped rolls off the ground and protect packaging damage.
02
Record delivery, deployment and cover dates for exposed work.
03
Request project review where delayed cover or extended exposure is likely.
Published technical data
Kontain KNP Series
Strength-based identifiers keep the product schedule directly tied to the published tensile class. Values shown are minimum average roll values unless otherwise stated.
| Property | Test method | Unit | KNP-09 | KNP-12 | KNP-15 | KNP-18 | KNP-21 | KNP-25 | KNP-30 | KNP-36 | KNP-48 | KNP-54 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tensile strength MD/CD | ISO 10319 | kN/m | 9 | 12 | 15 | 18 | 21 | 25 | 30 | 36 | 48 | 54 |
| Tensile elongation MD/CD | ISO 10319 | % | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 |
| Grab tensile strength | ASTM D4632 | N | 450 | 710 | 970 | 1,100 | 1,300 | 1,500 | 1,800 | 2,000 | 2,200 | 2,500 |
| Grab elongation | ASTM D4632 | % | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 | 40–80 |
| CBR puncture strength | ASTM D6241 / ISO 12236 | kN | 1.6 | 2.0 | 2.4 | 2.9 | 3.4 | 4.0 | 5.4 | 6.4 | 8.0 | 8.6 |
| Trapezoidal tear strength | ASTM D4533 / ISO 13937-2 | kN | 0.23 | 0.30 | 0.35 | 0.42 | 0.49 | 0.60 | 0.73 | 0.82 | 1.15 | 1.25 |
| UV resistance after 500 h | ASTM D7238 | % retained | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 |
Apparent opening size0.05–0.30 mmASTM D4751 · project-specific value to be confirmed
PermittivityK × 10−1 to 10−3 cm/sK = 1.0–9.9 · ASTM D4491 / ISO 11058
Roll widths2 / 2.5 / 3 / 4 / 5 / 6 mSubject to production confirmation
Roll lengths50 / 100 / 150 / 200 mCustom project lengths available
Filtration note.The opening-size and permittivity ranges describe available manufacturing capability; they are not fixed by tensile grade alone. Nominate or confirm hydraulic properties for the project soil and flow condition.
TDS
Controlled technical download
KNP Continuous-Filament PET Nonwoven Geotextiles
Kontain branded · document KNT-TDS-KNP-001 · Revision R01 · July 2026
Wholesale project-direct supply
Designed for planned, container-scale requirements.
Kontain works directly with production and keeps stockholding limited. That model is best suited to larger projects where manufacturing and freight can be planned efficiently—allowing competitive project-delivered pricing without stripping out technical support.
01Custom roll planning
Coordinate widths, lengths and grade mix around panel layout, handling limits and container utilisation.
02Technical selection
Start from function, soil, aggregate, geomembrane and construction conditions rather than a generic product substitution.
03Project documentation
Receive exact-grade TDS, production and batch documentation, shipping coordination and nominated verification requirements.
04One technical contact
Kontain supports the selection, proposal, delivery planning and site questions through one accountable project interface.
Project enquiry
Send the conditions. Get an exact grade and supply plan.
For filtration, include soil grading and hydraulic duty. For separation, include subgrade, aggregate and construction plant. For protection, include liner, aggregate grading, particle shape and applied pressure.
What Kontain can issue
Exact documents depend on the nominated grade, project specification and purchase scope.
TechnicalTDS + selection note
Grade-specific data and the reasoning behind the proposed application range.
QualityBatch and release records
Manufacturing, inspection and broken-needle control documentation by agreement.
LogisticsRoll and container schedule
Widths, lengths, grade mix, quantity and coordinated project delivery.