XR-5 vs HDPE Geomembrane
HDPE is the commodity workhorse of geomembranes; XR-5 is a premium reinforced ethylene interpolymer alloy fabric. HDPE wins big open containments on material economics and broad chemical resistance. XR-5 wins where fuels, dimensional stability, and prefabricated panels govern: tank farm containment, exposed covers, and detail-heavy sites. The application, not the brand, should make the call.
How the two options compare
| Factor | XR-5 (reinforced EIA) | HDPE |
|---|---|---|
| Construction | Ethylene interpolymer alloy coating over woven polyester fabric | Single-ply extruded polyethylene sheet |
| Governing reference | Manufacturer-published data per ASTM D751 methods | GRI-GM13 |
| Strength behavior | Scrim carries load; low elongation, high dimensional stability | Sheet carries load; high elongation, higher thermal expansion |
| Fuel and hydrocarbon service | Published immersion data for fuels including diesel and jet fuel | Broad resistance; verify long-term fuel contact by formulation |
| Exposed service | Long exposed record; panels lie flat through temperature swings | Long exposed record with carbon black; wrinkles managed in placement |
| Fabrication | Folds; shop-prefabricated into large panels with few field seams | Deploys from rolls; every panel seam welded in the field |
| Detail work | Scrim carries load into battens and mechanical terminations | Extrusion-welded details; terminations need careful design |
| Material economics | Premium material; earns it back on labor, schedule, and service life | Commodity sheet; dominates large-area work on cost |
| Typical applications | Fuel storage secondary containment, exposed covers, detail-heavy containments | Landfills, mining, ponds, large chemical containment |
A commodity sheet against an engineered fabric
HDPE geomembrane is an unreinforced extruded sheet whose properties come from the polyethylene itself, specified generically through GRI-GM13 and produced by many manufacturers in thicknesses from 40 to 100 mil and beyond. XR-5 is a proprietary reinforced product: an ethylene interpolymer alloy coating over a woven polyester scrim, specified against the manufacturer's published data sheet using the ASTM D751 coated-fabric test methods, with the 30 oz/yd2 grade as the baseline and heavier grades published for higher-demand work.
That structural difference sets the terms of the comparison. HDPE stretches, so it conforms and forgives; the scrim in XR-5 barely elongates, so it holds its dimensions and its flatness. HDPE competes on commodity economics; XR-5 competes on performance properties polyethylene cannot match. Neither material replaces the other across the board, which is why both remain on approved-material lists decades into their service records.
Fuel and chemical service
XR-5's signature application is hydrocarbon containment. The manufacturer publishes immersion and compatibility data for fuels including diesel and jet fuel, oils, and a wide range of industrial chemistry, and EIA membranes have a long record in tank farm secondary containment, fuel-handling facilities, and military fuel storage, where the liner may hold a spill in contact for days and must not soften or swell.
HDPE's chemical envelope is genuinely broad, including many hydrocarbons, and for incidental contact and drainage-style containment it serves well; SPCC containments in HDPE are common and compliant. The distinction appears at sustained contact and elevated temperature, where specific fuels can swell polyethylene, so long-duration fuel exposure should be verified against the resin manufacturer's data. Where a facility's worst case is a slow-found spill of aggressive fuel, specifying engineers frequently write EIA into the section. For either material, the compatibility check against the actual fluid belongs in the submittal, not the closeout.
Dimensional stability and exposed service
The polyester scrim gives XR-5 very low thermal expansion and low elongation, so panels stay flat and tight through daily temperature swings. On exposed containments, that behavior pays for itself: no bridged wrinkles for wind to work on, clean stormwater shedding, and terminations that stay tight over years of cycling. It is a large part of why XR-5 dominates exposed, structure-heavy containments such as tank ring walls.
HDPE also serves exposed for decades when formulated with 2 to 3 percent carbon black per GRI-GM13, and on large open geometries its thermal wrinkles are a manageable placement issue rather than a defect. But on containments crowded with pipe penetrations, sumps, and concrete transitions, chasing a moving sheet through every detail adds field hours, and the flat-lying reinforced fabric is simply easier to build well.
Prefabrication and installed economics
XR-5 folds without damage, so a fabrication shop can weld it into very large one-piece panels, bench-test the factory seams, and ship the panel folded. Field crews unfold it, close a handful of heat-welded field seams, vacuum test them, and bolt off the terminations. On a tank farm interior or a small detail-heavy containment, that compresses the field window dramatically and moves most of the QA indoors. Our shop prefabricates panels and our crews have installed 45 mil XR-5 with stainless steel mechanical attachments on fuel storage containment and large cover work.
HDPE cannot fold, so it deploys from rolls with every panel seam welded and tested in the field, an operation whose cost scales with seam footage but whose per-square-foot material price is a fraction of a premium reinforced fabric. On acres of open pond, cell, or pad, nothing beats that arithmetic. The honest comparison is installed cost over the service life for your geometry: material-dominated projects favor HDPE, labor- and detail-dominated projects narrow or reverse the gap, and fuel-service requirements can take HDPE off the table before economics enter.
Which applications default to each
XR-5 is the default for fuel storage secondary containment, exposed liners around tanks and process structures, floating and suspended covers in demanding service, and prefabricated containments where geometry, access, or schedule reward shop fabrication. It is also the sheet that stays on the shortlist when a specification demands decades of fully exposed service with minimal maintenance.
HDPE is the default for landfill liners and caps, heap leach pads and mining ponds, large water and wastewater impoundments, and general chemical containment, anywhere area is measured in acres and the fluid chemistry sits inside polyethylene's envelope. We install both materials, so the recommendation you get from us is driven by the containment liquid, the geometry, and the exposure, not by a preference for one product line.
We install both
Frequently asked questions
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