Leading Geomembrane supplier in Malaysia.

A continuous polymer barrier against liquid and gas.

A geomembrane is a continuous polymer sheet, typically 0.5-3.0 mm thick, manufactured to provide a low-permeability barrier between the ground and a contained fluid (water, leachate, brine, tailings, hydrocarbon). Permeability of properly installed HDPE geomembrane is less than 1×10⁻¹⁴ m/s, multiple orders of magnitude tighter than even the best compacted clay liner. Unlike geotextile (flow-through) or geogrid (open mesh), the geomembrane's design intent is impermeability. Material selection, thickness, seam quality, and protection from puncture are the four engineering levers that determine whether the barrier works for its design life.

Geomembrane arrives in factory-manufactured rolls (typical width 7-8 m, length 100-200 m), welded together on site by hot-wedge dual-track machines (creating two parallel welds with a 10-15 mm test channel between them for air-pressure NDT) or extrusion welders (for patches, repairs, and detail welds around fittings). Every metre of seam is non-destructively tested before the liner is covered.

HDPE, LLDPE, PVC, or EPDM.

Engineering shorthand: HDPE for chemistry, LLDPE for flexibility, PVC for water, EPDM for specialty. Most Malaysian projects default to HDPE for any application with chemical exposure or design life above 50 years.

Where geomembrane fits.

Hot-wedge primary, extrusion repair.

Hot-wedge dual-track welding

The primary seam-making method for HDPE and LLDPE rolls. A heated wedge (typically 350-450°C) is fed between the overlapping sheets while rollers apply pressure. Two parallel welds are made simultaneously with an air channel between them (10-15 mm wide). The air channel is later pressurised for NDT. Speed: typically 1-3 m/min depending on thickness and conditions. Welds are continuous along the full length of the panel-to-panel join. Welder operator certification per project requirement (typically GRI training, IAGI certified, or equivalent).

Extrusion fillet welding

For repairs, patches, and detail welds at pipe penetrations, fittings, and panel intersections that cannot accept a wedge. Heated polymer rod (same polymer as the geomembrane) is extruded along the seam edge by a portable extruder. Pressure and temperature control critical to avoid undercut or porosity in the bead. Manual welder skill is the controlling factor; certified welders only.

Trial weld (start of shift and material change)

At the start of each shift and after any change of material or weather conditions, a trial weld is made on scrap geomembrane and tested for peel and shear strength against GRI-GM19 minimum values. Trial weld pass-fail is documented in the QA log before production welding starts.

Every metre of seam verified.

Air-pressure test (hot-wedge dual-track)

The air channel between the two parallel hot-wedge welds is sealed at both ends and pressurised to 30-35 psi for HDPE (per GRI-GM6 / ASTM D5820). The pressure is held for 5 minutes and the pressure drop is recorded. Drop within the allowable limit (typically less than 4 psi for 1.5 mm HDPE) indicates a continuous airtight channel and therefore continuous welds on both sides.

Vacuum box test (extrusion welds and patches)

A negative-pressure box (typically 25 kPa vacuum, ASTM D5641) is placed over the seam with soap solution applied. Bubbles indicate a leak. Used for extrusion welds, patches, and any seam type where air-pressure testing is not applicable.

Spark test (conductive systems)

For double-liner systems with a conductive lower layer, a spark voltage is applied across the upper liner and any pinhole is detected as a spark. Used on landfill basal systems where a small pinhole could be catastrophic.

Geoelectric leak detection (optional, critical projects)

ASTM D7007 method. The installed liner is wetted, a voltage applied across the liner, and a survey grid locates any current path through pinholes. Locates leaks anywhere in the installation, not just at seams. Best used as a final acceptance test before backfill. Adds cost but adds confidence for hazardous waste, fuel containment, and mining tailings.

Destructive testing

Seam coupon samples cut at intervals (typically one sample per 150 m of seam) are tested in the field laboratory for peel strength and shear strength per ASTM D6392 / D7466 against GRI-GM19 minima. Destructive test results form part of the QA submission.

What changes in our climate.

• Elevated installation temperature: Malaysian daytime ground temperatures of 35-50°C on exposed HDPE require careful weld temperature control. Cool of day (early morning) is the preferred welding window for QA-critical seams.
• Monsoon rainfall: wet seam surfaces fail QA. Installations during peak monsoon require temporary covers. Project programme should respect dry-window timing for major liner placements.
• Subgrade preparation in tropical residual soil: high fines and weathering products require thorough preparation before liner placement; sharp gravels removed, surface trimmed, subgrade compacted to design density.
• Aggressive porewater in peat: for projects on deep peat (Sabah, Sarawak), porewater pH below 4 calls for HDPE specifically; PVC and EPDM may not be appropriate.
• DOE Malaysia compliance: hazardous and non-hazardous waste landfill liner systems require DOE approval. Specification, installation QA, and as-built submission are all part of the regulatory process. Engagement with DOE Cawangan should be early in project programme.
• UV exposure window: exposed geomembrane (anchor trench detail, slope side liner not yet covered) should be covered within manufacturer-stated UV window (typically 30-60 days for HDPE with carbon black, shorter for PVC).

From application to liner specification.

1. Contained fluid chemistry: aqueous, hydrocarbon, brine, acidic, alkaline, sulphate-bearing. Chemistry decides polymer.
2. Design life: 25, 50, 100, or 300 years. Combined with chemistry, decides polymer (HDPE for > 100 years in aggressive chemistry).
3. Subgrade conditions: regular vs irregular, settlement potential, stress concentrations. Decides flexibility (HDPE for regular; LLDPE for irregular or steep slopes).
4. Stress at slope or interface: from filling cycles, vehicle traffic, seismic. Decides texture (smooth interior, textured at slope-soil interface for friction).
5. Thickness: 0.5-3.0 mm. Driven by design life, puncture risk, regulatory minimum (e.g. 1.5 mm minimum for hazardous landfill DOE Malaysia).
6. Protective geotextile cushion: 400-800 gsm nonwoven above and below the geomembrane to prevent puncture. Specified per GRI-GT12.
7. Detail design: anchor trench (geometry, depth), pipe penetration boots, sumps, crest details. Per GRI-GM14 and project-specific drawings.
8. QA plan: trial welds, NDT frequency, destructive sampling, geoelectric leak detection if specified. Documented before installation starts.
9. Installer qualification: welder certification, supervisor qualification, third-party QA inspector if specified.

What goes in the spec section.

All declared values per manufacturer test certificate. Acceptance per GRI-GM13 (HDPE) or GRI-GM17 (LLDPE).

Codes for design and submission.

Common grades in local stock, specialised ex-factory.

All Selangor (Klang Valley) stock-holding for nationwide despatch. WhatsApp +60 16-428 1214 for stock confirmation on any grade, same-day quote turnaround including welding crew + NDT mobilisation if installation is in scope.

Every state, every project size.

From the Selangor (Klang Valley) stock-holding facility, geomembrane rolls despatch to every Malaysian state. Welding crew (hot-wedge dual-track + extrusion fillet) plus NDT equipment (vacuum-box, air-pressure, spark) mobilise separately on the project schedule. Times below are despatch-to-site transit; production / ex-factory lead times stack on top for non-stocked grades.

From WhatsApp message to commissioned liner.

Environmental and civil engineers, contractors, and procurement usually ask:

Go deeper on design.

Geomembrane pairs with these scopes.

Geomembrane across Malaysia.

Geomembrane properties by test standard.

Specification basis: GRI-GM13 (HDPE), GRI-GM17 (LLDPE), GRI-GM19 (seams). DOE Garis Panduan typically requires HDPE 1.5 to 2.0 mm for non-hazardous MSW landfill basal liner; 2.0 to 2.5 mm for hazardous waste. LLDPE typical for cap liners over settled waste cells (better elongation). Textured HDPE required on slopes steeper than 1V:3H per interface friction analysis. NDT plan: 100 percent hot-wedge seam tested by air-pressure (ASTM D5820), all extrusion seams by vacuum box (ASTM D5641), optional geoelectric leak detection (ASTM D7007) on completed liner. CIDB G7 certified welders.

Related geomembrane pages.