BARE COREKDRAIN TN
Triplanar HDPE geonet
Unlaminated three-dimensional core for applications where the adjacent geosynthetics are designed and installed separately.
KTN-50 · KTN-55 · KTN-60 · KTN-63 · KTN-70KDrain Series · triplanar drainage systems
Make drainage capacity survive the load.
HDPE triplanar geonet cores and double-sided geotextile composites selected from the required flow, normal stress, gradient, boundary materials and long-term exposure—not thickness alone.
Published flow values are short-term index data at 480 kPa, hydraulic gradient 1.0 and 15 minutes. Final design should use ASTM D4716 testing under the actual project conditions and a site-specific long-term reduction basis.
5 grades5.0 to 7.0 mm standard cores
4 / 5 / 6 mstandard manufacturing widths
30 / 40 mstandard roll lengths
Site-specific100-hour flow and creep pathway
Kontain private-label range
One core family. Three supply configurations.
The grade code identifies construction, facing polymer and nominal thickness. The current TDS data represent PET facings; PP nonwoven alternatives are available with separate order-specific data and certification.
BARE CORE
DOUBLE-SIDEDKDRAIN DC150
150 g/m² PET composite
Triplanar core factory-laminated to 150 g/m² PET filament nonwoven geotextile on both faces for filtration, separation and core protection.
KDC150-PET-50 through KDC150-PET-70HEAVIER FILTERKDRAIN DC200
200 g/m² PET composite
Heavier double-sided PET nonwoven construction represented by the current TDS. PP facings can also be manufactured but require their own project schedule and supporting data.
KDC200-PET-50 through KDC200-PET-70Code logicKTN = bare triplanar net · KDC150 / KDC200 = double-sided composite and facing mass · PET / PP = facing polymer · final two digits = nominal core thickness in tenths of a millimetre. Published composite values on this page and in the TDS represent PET.
System position matters
Drainage is an interface, not a standalone roll.
The same core can behave differently between rigid platens, geomembrane, geotextile, soil or waste. The project test stack should reproduce the actual upper and lower boundaries, normal stress, gradient, liquid and installation orientation.
- Confirm filter retention and clogging compatibility with the adjacent soil.
- Check interface shear using the complete lining profile on slopes.
- Detail outlets, overlaps, penetrations and continuity around structures.
- Protect the core from crushing, local bridging and construction damage.
Leachate collection / protective layer
Primary geomembrane
Upper PET or PP geotextile facing
KDrain leak detection / collection core→ → → →
Lower PET or PP geotextile facing
Secondary geomembrane
Secondary GCL or compacted clay
Prepared subgrade
Applications
Start with the liquid path and consequence of loss of flow.
Drainage demand, available head, outlet spacing and system reliability govern whether a geocomposite is appropriate and which site-specific tests are justified.
Landfill leachate collection
Convey leachate above the primary liner, subject to site liquid, intrusion, biological loading and long-term transmissivity verification.
Leak detection layers
Provide rapid in-plane flow between barrier layers while retaining an auditable factor of safety at the design normal stress.
Caps and gas drainage
Transmit infiltration or gas beneath cover systems, with root and biological clogging risk selected for the actual cap profile.
Under-liner groundwater relief
Relieve groundwater and uplift pressure beneath ponds, reservoirs and containment liners using the complete boundary condition in testing.
Retaining structures
Replace thick granular drainage zones where filtration, connection, outlet spacing and long-term flow are designed together.
Civil and building drainage
Drain roof decks, tunnels, buried walls and capillary-break profiles where load, gradient, water quality and outlet continuity are defined.
Evidence boundary
What the current test report proves—and what it does not.
Independent sample testing is useful, but the tested specimen, boundary condition and duration must stay attached to every stated result.
Mean bare-core transmissivity
Two machine-direction specimens at 480 kPa, hydraulic gradient 1.0, 15-minute seating and rigid plates. Individual results were 1.66 × 10⁻³ and 1.76 × 10⁻³ m²/s.
Mean rib lay-down yield
Five specimens ranged from 549.9 to 702.0 kPa. This is short-term fixed-plate compression behaviour of the submitted bare geonet sample—not long-term flow retention.
Submitted geonet sample
The report does not identify a finished Kontain grade, geotextile laminate or production population. It is supporting sample evidence, not a MARV or a transferable design value.
GRI-GN4Outside stated scope
GRI-GN4 expressly covers biplanar geonets and says it does not cover triplanar geonets or drainage composites made from them. KDrain is therefore not represented as GRI-GN4 compliant. The TRI fixed-plate compression result is also not directly comparable with GN4's movable-plate biplanar requirement.
Review GRI-GN4Published technical data
Short-term index values by core thickness.
Values below reproduce the current supplier data supplied to Kontain. Confirm the final project schedule, certificate and test boundary before procurement.
| Property | Method | Unit | KTN-50 | KTN-55 | KTN-60 | KTN-63 | KTN-70 |
|---|---|---|---|---|---|---|---|
| Nominal thickness | ASTM D5199 | mm | 5.0 | 5.5 | 6.0 | 6.3 | 7.0 |
| Density | ASTM D1505 | g/cm³ | ≥0.95 | ≥0.95 | ≥0.95 | ≥0.95 | ≥0.95 |
| Carbon black | ASTM D4218 | % | 1.5–3.0 | 1.5–3.0 | 1.5–3.0 | 1.5–3.0 | 1.5–3.0 |
| MD tensile strength | ASTM D7179 | kN/m | ≥8 | ≥9 | ≥10 | ≥11 | ≥12 |
| Published compressive strength | ASTM D6364 / D1621 | kPa | 400 | 400 | 500 | 500–550 | 500–600 |
| Bare-core flow @ 480 kPa, i=1.0, 15 min | ASTM D4716 | L/min/m | ≥90 | ≥100 | ≥110 | ≥124 | ≥140 |
| Property | Method | Unit | 50 | 55 | 60 | 63 | 70 |
|---|---|---|---|---|---|---|---|
| Finished-composite flow @ 480 kPa, i=1.0, 15 min | ASTM D4716 | L/min/m | ≥30 | ≥35 | ≥40 | ≥45 | ≥55 |
| Equivalent published transmissivity @ i=1.0 | Calculated from declared flow | m²/s | ≥5.00×10⁻⁴ | ≥5.83×10⁻⁴ | ≥6.67×10⁻⁴ | ≥7.50×10⁻⁴ | ≥9.17×10⁻⁴ |
| Ply adhesion | ASTM D7005 | N/m | ≥170 | ≥170 | ≥170 | ≥170 | ≥170 |
| Standard roll widths | Nominal | m | 4 / 5 / 6 | 4 / 5 / 6 | 4 / 5 / 6 | 4 / 5 / 6 | 4 / 5 / 6 |
| Standard roll lengths | Nominal | m | 30 / 40 | 30 / 40 | 30 / 40 | 30 / 40 | 30 / 40 |
Facing data: the current TDS represents PET facings. The 150 g/m² PET values are 550 N grab, 9 kN/m wide-width tensile, 250 N tear and 1.6 kN CBR puncture. The 200 g/m² PET values are 710 N grab, 12 kN/m wide-width tensile, 330 N tear and 2.1 kN CBR puncture. PP alternatives require separate order-specific data.
Hydraulic limitation: the published composite flow data are at one load, one gradient and 15-minute seating. They are not q100, do not include project boundaries and do not establish allowable long-term flow.
Preliminary drainage design tool
Screen published flow against the site demand.
The tool exposes the selected test value and every reduction factor. It does not convert 15-minute catalogue data into a certified long-term design value.
01
Select the hydraulic evidence
35 L/min/m at 480 kPa and i=1.0; published construction uses PET geotextile facings. The selected transmissivity is multiplied by the entered gradient for screening; verify non-linear behaviour by testing at the project gradient.
02
Define the required unit flow
The catchment method assumes each metre of drainage width receives flow from the entered upslope drainage length. Confirm the governing project hydrology and drainage geometry.
03
Set risk and exposure
04
Review reduction factors
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The suggestion increases with design duration and consequence. Replace it with a product-, load- and temperature-specific creep factor when testing is available.
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This additional screen allows for soft-boundary intrusion and interface effects not reproduced by the published rigid-plate result. Confirm by finished-composite testing.
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The suggestion is selected within the GRI-GC8 application range using the chosen consequence level. Project liquid chemistry and precipitate potential still require engineering review.
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The suggestion is selected within the GRI-GC8 application range. Increase or justify it for nutrient-rich leachate, roots, biofilm or long closure periods.
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A project-selected allowance for laps, outlets, local discontinuities and construction effects. It is not a prescribed GRI-GC8 factor and should reflect the actual detailing and QA plan.
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A screening target linked to consequence and confidence. The Engineer of Record should select the final factor of safety for the drainage function.
GRI-GC8 supplies application ranges for chemical and biological clogging. Creep, intrusion, construction and factor-of-safety defaults shown here are conservative screening assumptions—not tested KDrain values or prescribed GRI-GC8 numbers.
Evidence statementEvidence changes the result only when its value is entered.
Select Enter project-specific test value to replace catalogue transmissivity, and overwrite any suggested reduction factor when supported by testing. A published-data pass remains a preliminary screen, not design qualification.
Project-specific performance testing
Test the profile that will actually be built.
Kontain can coordinate drainage-composite qualification through a partner laboratory. For higher-risk work, the programme should move beyond catalogue flow and reproduce the design stack.
100-hour transmissivity
ASTM D4716 / GRI-GC8 using actual normal stress, gradient, boundaries, liquid, orientation and finished composite.
Long-term creep
Core-only creep deformation, typically to 10,000 hours under GRI-GC8, to derive a product- and condition-specific RFCR.
Interface and filtration
Project filter compatibility, geotextile intrusion, interface shear and outlet/overlap detailing.
Chemical suitability
Representative-liquid immersion and a go/no-go polymer review where leachate, brine, process water or aggressive chemistry is present.
Project-direct supply
Size the rolls now. Confirm the container loading before quote.
Standard roll formats are 4, 5 or 6 m wide and 30 or 40 m long. Lengths and core thickness can be customised, including cores up to 8 mm, subject to production and freight review.
No invented container countThe supplied documents do not state reliable rolls per container. Roll outside diameter, core, wrap, compression limits and loading method can change utilisation, so Kontain confirms the factory loading plan for the selected construction.
Selected codeKDC150-PET-55
Area per roll200 m²
Preliminary rolls54
Supplied area10,800 m²
Roll count is a geometric estimate only. Kontain will confirm roll mass, outside diameter, container utilisation, production minimum and freight plan before issuing pricing.
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