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Carbofol® + HDPE geomembrane

Naue Carbofol® + HDPE geomembrane is an enhanced oxidation-resistant liner for mining containment, landfill sealing and other critical barriers.

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  • Close-up of a black Naue Carbofol® + geomembrane.
  • Close-up of a Naue Carbofol® geomembrane with embossed surface structure from the top.
  • Close-up of a Naue Carbofol® geomembrane with embossed surface structure from the bottom.
  • Workers installing Carbofol® liners on the sloped sides of an expansive mininig facility.
  • Construction workers unroll a large Carbofol® liner across a sloped earthworks site on a landfill.
  • Aerial view of a large landfill construction site with Carbofol® + HDPE geomembrane liners being installed for capping.
  • Enhanced HDPE geomembrane for mining, landfill and critical containment.
  • Impermeable polymeric barrier (GBR-P). Extended OIT ≥ 200 min and HP-OIT ≥ 600 min resist chemical attack and UV.
  • Carbofol® + 406 2.0 s/s GM13 (smooth) · 406 2.0 BF/TF GM13 (embossed slope liner).
  • Tensile at yield ≥ 29 kN/m · Puncture ≥ 535 N · Density ≥ 0.940 g/cm³.
  • CE (AVCP 2+) · GRI GM-13 · BAM · ISO 9001 · ISO 14001.

Carbofol® + is an enhanced HDPE geomembrane for sealing in mining, landfill, and critical containment applications. You install it as a primary or secondary liner in base and slope sealing systems. It forms an impermeable polymeric barrier (GBR-P) against leachate, process liquids, and groundwater contamination. Its extended oxidation resistance delivers long-term liner integrity under demanding conditions.

Mining containment and hazardous waste landfills expose geomembranes to aggressive chemicals, high UV radiation, and extreme physical stress. Standard GRI GM-13 geomembranes may not provide sufficient oxidation resistance for these conditions. Carbofol® + solves this with OIT ≥ 200 min (ASTM D8117) and HP-OIT ≥ 600 min (ASTM D5885), doubling the GM13 baseline values.

Roll format 120 m × 7.5 m reduces the number of field welds significantly compared to 5.0 m standard rolls. Fewer welds mean lower installation cost and fewer potential failure points. Extended oxidation resistance lowers lifecycle risk and reduces the cost of future remediation.

Carbofol® + complies with GRI GM-13 at OIT ≥ 200 min (ASTM D8117) and HP-OIT ≥ 600 min (ASTM D5885). Density: ≥ 0.940 g/cm³ (EN ISO 1183). NCTL stress crack resistance: ≥ 500 h (ASTM D5397). Asperity height: ≥ 0.9 mm for BF/TF grades (ASTM D7466). MFR: 1.0 to 3.0 g/10 min (EN ISO 1133, 190 °C / 5.0 kg) for consistent weld quality at typical temperatures of ~380 °C.

Carbofol® + HDPE geomembrane function:

  • Barrier

    Barrier

    Forms an impermeable polymeric barrier (GBR-P) preventing migration of leachate, process liquids, and contaminants through the liner.

Carbofol® + HDPE geomembrane advantages: oxidation resistance and slope stability

  • Safety

    Extended oxidation resistance

    OIT ≥ 200 min and HP-OIT ≥ 600 min exceed GM13 by 2×. Antioxidant reserve documented after oven ageing (ASTM D5721).

  • Roll

    Straightforward installation

    Standard roll 120 m × 7.5 m reduce the number of field seams per unit area compared to 5.0 m rolls. Fewer welds mean lower risk of liner failure, and shorter installation time.

  • Speed

    Superior weldability

    MFR 1.0 to 3.0 g/10 min (EN ISO 1133) enables consistent weld quality at ~380 °C. Lower weld temperature preserves antioxidant reserve at the weld zone.

  • No delamination risk

    No delamination risk

    BF/TF embossed structure with dimples moulded directly into the HDPE melt. Asperity height ≥ 0.9 mm for high interface friction.

  • Certificate

    Certified 40+ years

    BAM approved since 1989. Declared service life 25 years for exposed applications (DoP Annex B). CE marking AVCP System 2+.

Application areas

Typical applications:

  • Tailings storage facility (TSF) base liner and side slope liner
  • Heap leach pad primary and secondary liner
  • Mine water containment pond and evaporation basin
  • Mine closure and recultivation capping system

Carbofol® + is the preferred HDPE geomembrane for tailings storage facility liners and heap leach pad applications. It forms an impermeable base liner beneath mine residues, preventing leachate from entering the groundwater. The extended OIT (≥ 200 min) and HP-OIT (≥ 600 min) protect the liner under prolonged exposure to acid mine drainage, cyanide solutions, and other aggressive mining process liquids. For slope applications, the BF/TF embossed surface structure enables stable liner installation on inclinations from 20 to 45 degrees, including near-vertical rocky sections requiring bolt anchoring.

Workers installing geomembrane liners on the sloped sides of an expansive mininig facility.

To the application:

Mining

Typical applications:

  • Landfill base liner (Class I, II, III per national regulations)
  • Cap and closure liner system over closed landfill cells
  • Intermediate liner between waste deposition phases
  • Landfill cap in piggyback expansion where aggressive gas is present

Carbofol® + provides enhanced protection in landfill applications where standard GM13 performance may be insufficient. Industrial and hazardous waste facilities produce leachate with high chemical aggression. Carbofol® + extends liner lifespan by doubling the standard OIT value. The BF/TF variant ensures stable slope sealing in cap systems and on engineered side slopes. It is the choice when aggressive chemistry demands more than the GM13 baseline.

Construction workers unroll a large geomembrane liner across a sloped earthworks site on a landfill.

To the application:

Landfill engineering

Technical properties

PropertyUnitCarbofol® +
Oxidative resistance – the defining property of the "+" types
Oxidation induction time (OIT)min200
High-pressure oxidation induction time (HPOIT)min600
Residual OIT and HPOIT after oven ageing—Significant percentage retained
Reference requirement GRI-GM13 (for comparison)
Oxidation induction time (OIT)min≥ 100
High-pressure oxidation induction time (HPOIT)min≥ 400
Product configuration
Documented types—Carbofol® + 406 2.0 7.5 s/s GM13 MT and Carbofol® + 406 2.0 7.5 BF/TF GM13 MT
Manufacturing widthmup to 7.50
Surface—Smooth, and BF/TF embossed for slopes and shear-stress transmitting applications
Exemplary technical illustration of a Naue Carbofol® + geomembrane shown as a black HDPE liner on a light grey background, exposed to aggressive chemicals from both sides: acid from one laboratory flask and sodium cyanide solution from another.
Exemplary technical illustration of a Naue Carbofol® + geomembrane shown as a black HDPE liner on a light grey background, exposed to aggressive chemicals from both sides: acid from one laboratory flask and sodium cyanide solution from another.
Exemplary illustration. Naue Carbofol® + geomembrane is designed for demanding containment applications and provides enhanced oxidation resistance under aggressive chemical exposure, including acidic and alkaline process environments.
Exemplary illustration. Naue Carbofol® + geomembrane is designed for demanding containment applications and provides enhanced oxidation resistance under aggressive chemical exposure, including acidic and alkaline process environments.

HDPE geomembrane oxidation resistance: OIT and HP-OIT matter

Carbofol® + addresses the central long-term failure mechanism in HDPE geomembranes: polymer oxidation. It depletes the antioxidant stabilisers in the PE matrix; once depleted, the polymer embrittles and loses stress crack resistance - accelerated by aggressive chemicals, acidic mine drainage and UV radiation.

Standard GRI GM-13 requires OIT ≥ 100 min (ASTM D8117) and HP-OIT ≥ 400 min (ASTM D5885) - baseline values calibrated for general applications. GRI Whitepaper No. 6 documents that antioxidant depletion accelerates significantly under acidic and basic conditions, exactly what heap leach operations and tailings ponds create. Carbofol® + doubles both parameters - OIT ≥ 200 min, HP-OIT ≥ 600 min - and maintains the required residual values after oven ageing (ASTM D5721), giving designers a quantified safety reserve to document in their specification.

The combined OIT and HP-OIT stabiliser packets matter most where future chemistry is uncertain: mining projects change process chemistry over time, and the liner defends against both acidic leaching agents (e.g. sulfuric acid in copper production) and basic process liquids (e.g. sodium cyanide in gold processing). All standard GM13 mechanical properties are retained - ductility and weldability are not compromised.

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Frequently asked questions

Carbofol® + is an enhanced HDPE geomembrane with OIT ≥ 200 min (ASTM D8117) and HP-OIT ≥ 600 min (ASTM D5885). Standard Carbofol® meets the GM13 baseline of OIT ≥ 100 min and HP-OIT ≥ 400 min. The ‘+’ designation indicates doubled oxidation resistance. Density of both grades: ≥ 0.940 g/cm³. Carbofol® + is the choice for mining, aggressive leachate environments, and high UV applications.

Pricing depends on project volume, variant, roll format, and delivery location. Contact Naue directly via request form below for a project-specific quotation.

Use smooth s/s on horizontal base liners where slope friction is not the design driver. Use BF/TF on slopes steeper than approximately 1:9 (6 degrees). BF/TF asperity height ≥ 0.9 mm (ASTM D7466) increases interface friction. BF/TF also allows heated wedge welding without grinding.

HP-OIT (ASTM D5885) measures oxidation resistance under elevated pressure, simulating long-term conditions in lined systems. Carbofol® + HP-OIT ≥ 600 min provides a 50 % safety reserve over the GM13 baseline of 400 min. This is critical for TSF and heap leach liner longevity.

Carbofol® + carries CE marking (AVCP System 2+, EN 13493), GRI GM-13 compliance with enhanced OIT and HP-OIT values, BAM approval for German landfill applications (since 1989), and ISO 9001 / ISO 14001 manufacturing certification. Declared service life: 25 years for exposed applications (DoP Annex B).

The BF/TF variant was verified in the TSF South-East Europe project on slopes 20 to 45 degrees. Asperity height ≥ 0.9 mm (ASTM D7466) and puncture resistance ≥ 535 N (EN ISO 12236) ensure durability. Rock bolt anchoring (394 bolts in TSF reference project) enables use on near-vertical rocky faces.

Carbofol® + is available in 2.0 mm thickness. Standard roll size: 120 m × 7.5 m. Roll weight: approx. 1,680 kg (s/s) and approx. 1,788 kg (BF/TF). The 7.5 m width reduces the number of field welds per unit area compared to 5.0 m standard rolls.

Carbofol® + complies with EN 13493, DIN EN 1849-2 (thickness), GRI GM-13, ASTM D8117 (OIT), ASTM D5885 (HP-OIT), ASTM D5397 (NCTL), ASTM D7466 (asperity height), EN ISO 10319 / ASTM D6693 (tensile), EN ISO 12236 (puncture), EN ISO 1183 (density), and EN ISO 1133 (MFR). BAM approval applies to German landfill applications under DepV regulations.

Yes. Naue provides project-specific technical support through the Naue Portal and direct engineering assistance. Services include slope stability analysis, liner system design, shear strength testing, and specification writing. Discover the software in the Naue Portal or contact us for any assistance via contact form below.

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