OUR AKS LINER

Infraliner™

Factory-fabricated HDPE anchor knob sheet with integral V-Lock anchors. Mechanically locked into the concrete, not glued to it.

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2.0–5.0Thickness (mm)
430Knobs per m²
100+ yrDesign life
Close-up of blue HDPE liner sheet showing its anchor knobs

01 / WHAT IT IS

Protection that becomes part of the structure.

A high density polyethylene liner with V-Lock anchor studs across its back face. Once cast in, it's part of the concrete, not a layer sitting on top.

1
Fixed to the formworkSheets are prefabricated to suit the structure and fixed before the pour.
2
Locked in by the pourThousands of anchors are encapsulated and mechanically locked into the concrete.
3
Welded and testedEvery joint is extrusion welded on site into one continuous barrier, and every weld is spark tested.

02 / WHY MECHANICAL ANCHORING

Coatings have to be perfect everywhere. Anchors don't.

A sprayed coating depends on surface prep, temperature, humidity, film thickness and the person holding the gun. Get one wrong anywhere, and that's where it fails.

The liner is held by the anchors. The anchors are held by the concrete.

Performance against failure mechanisms
Biogenic H₂S corrosionSubstrate isolated
Chemical attack≤0.06% change
Live cracking1,496% elongation
Anchor retention561.6 kN/m² pull-out
Impact and puncture≥945 N
Moisture ingress0.031% absorption
Adhesion failureNo bond to fail

Chemical resistance to ASTM D543, eight reagents. Full data in TDS-IL-HDPE-001.

03 / TECHNICAL SPECIFICATION

Properties and test methods.

Infraliner™  /  Technical properties
Property Test method Value
Physical
Material – High density polyethylene
Sheet thickness ASTM D5199 2.0 / 2.5 / 3.0 / 4.0 / 5.0 mm
Sheet width – Up to 3,200 mm
Knob height – 15 mm
Knob density – 430 knobs/m²
Density ASTM D792 0.95 g/cc
Colour – Black, white, yellow, dual colour, custom on request
Mechanical
Tensile strength at yield ASTM D6693 ≥45 kN/m
Tensile strength at break ASTM D6693 ≥72 kN/m
Elongation at yield ASTM D6693 ≥14 %
Elongation at break ASTM D6693 ≥1,496 %
Tear resistance ASTM D1004 ≥440 N
Puncture resistance ASTM D4833 ≥945 N
Knob pull-out, to failure – 561.6 kN/m²
Durability & chemical resistance
Carbon black content ASTM D1603 2.18 %
Standard OIT ASTM D3895 Did not oxidise
Water absorption ASTM D570 0.031 %
Chemical resistance ASTM D543 8 reagents tested, all ≤0.06 % change
Porosity, spark test 7 kV Pass
Design service life – 100+ years, non-UV
Mechanical properties shown for 2.5 mm nominal sheet thickness. Values represent minimum averages across longitudinal and transverse test directions. For other thicknesses, contact Engineered Concrete Protection.

Source: TDS-IL-HDPE-001  ·  Issue 1.0  ·  May 2026

04 / WHERE IT IS USED

Built for the environments that wear concrete out fastest.

Sewer structuresMaintenance holes, trunk mains and tunnels under constant H₂S attack.
Pump stationsTurbulence, gas release and wetting and drying at the worst point.
Treatment structuresBioreactors, digesters and channels, chemistry and abrasion combined.
Precast productsLined at the plant, delivered ready to install.
Chemical bundsWhere a coating breach means a reportable release.
Mining and industrialProcess containment, tailings and heavy abrasion service.

05 / FOR SPECIFIERS

Lift this straight into your specification.

Specification clause

Concrete protection lining shall be an anchor knob sheet (AKS) liner: factory-fabricated high density polyethylene incorporating integral mechanical anchors on the rear face, cast into the concrete during placement. The liner shall not rely on adhesion to the substrate. All joints shall be extrusion welded and 100% tested in accordance with the manufacturer's inspection and test plan. Installation shall be carried out by an installer approved by the liner manufacturer.

Request a project-specific clause and CAD details →

06 / AVAILABILITY

Three ways to work with us.

Supply onlySheet, rolls, prefabricated panels and weld rod for your installer. PVC on request. Supply and installInfraliner™ delivered as a complete, tested system with QA handover. Your specified AKS systemAlready specified AGRU Sure Grip or similar? We install it to your detail, with the same testing and QA.

Specifying an AKS liner, or pricing one?

Send us the drawings. Whether it's Infraliner™ or the system you've specified, we'll come back with a quantity and a price.

Discuss your project

Call 0411 365 506