Woven polyester cord strapping typically lists break strengths of 650 lb at 1/2 in. width and 2,400 lb at 3/4 in. width at retail, with cross-woven polyester fibers giving the product measurable elongation under shock load [S2].
Extruded PET strapping band is a different construction: oriented polyester film, not woven yarn, designed for higher stiffness and lower creep, and it is the dominant non-metallic choice on automated palletizer lines [S5]. Both products replace steel banding in many plants, but they are not interchangeable on the same load profile.
What Each Product Actually Is
Woven cord strapping is built from polyester fibers woven in a multi-directional pattern, both horizontally and vertically, with a coated or uncoated finish depending on grade [S4]. The cross-weave structure lets the strap stretch slightly, then recover, so a shifting load gets damped instead of snapped against [S4].
Polyester strapping band (also called PET strapping) is an extruded and oriented plastic strap, smoother and stiffer than woven cord, and is usually embossed or smooth with a green, green/black, or natural tint [S5]. A standalone category called "polyester strapping" in catalogs can refer to either woven cord or extruded PET, so the construction wording matters more than the generic name [S3].
For a primer on the broader material family, the strapping band encyclopedia page lays out how polyester sits between polypropylene and steel on the cost-tension curve.
Break Strength and Width Classes on the Market
Published woven cord SKUs in distributor catalogs show three common working points: 1/2 in. × 3,900 ft at 650 lb break (16 lb coil, 4 coils/case) [S2]; 3/4 in. × 1,650 ft at 2,400 lb break [S2]; and 3/4 in. × 1,650 ft at 3,000 lb break as the upper mainstream SKU [S2].
Polyester strapping band on standard 1/2 in. and 5/8 in. widths sits in a comparable envelope for medium-duty pallet work, but its published metric is system break strength (strap plus seal) rather than strap-alone break, which inflates the headline number versus cord products [S5]. Woven cord numbers above are strap break strength, not system break.
When automated tension is in the loop, the strapping machine reference page documents the seal-and-cut heads that PET band needs but woven cord can skip.
Elongation, Memory, and Impact Behaviour
Woven cord strapping exhibits noticeable elongation under tension, which is exactly the property that lets it absorb shifting-load impacts during rail and over-the-road transit [S4]. The trade-off is a small permanent set after a heavy shock: the strap will not return to its original length, so re-tensioning a strap that has just arrested a load shift is part of the operating discipline [S7].
Extruded PET strapping has far less elongation and memory than woven cord, so it does not absorb impact the same way; instead, it relies on higher static tension to lock a rigid load in place [S6]. For loads that do not shift (stacked brick, sawn timber, coil steel OD-wrap), the lower-elongation PET profile is a better match because creep, not shock, is the dominant failure mode over weeks of storage [S8].
Tooling, Seals, and Buckle Pairing
Woven cord is typically joined with phosphate-coated wire buckles; the coating is deliberate, it creates friction against the woven fibers so the strap cannot back off the buckle under vibration [S4]. Using galvanized buckles on woven cord is a known misapplication: the smooth finish lets the strap slip, and the joint quietly loosens over a few days in transit [S4].
Composite (extrusion-coated) cord uses galvanized buckles instead, because the polypropylene coating would wear against a phosphate finish [S4]. PET strapping band uses metal serrated seals, closed (pusher) seals, or, on sealless tools, a friction-weld joint, none of which are compatible with cord buckles [S5]. A plant running both products on the same dock needs to keep the buckle SKUs physically separated, or the wrong pairing shows up at the worst time.
Decision Matrix: Cord vs PET Band
For shifting or irregular loads (machinery on skids, baled recyclables, pipe, lumber), woven cord wins on impact absorption, hand-tieability, and the ability to be re-tensioned with a simple wire-buckle and a hand tool [S3][S7]. For rigid, high-volume palletized loads on an automated line, PET band wins on creep resistance, joint consistency, and tool-cycle speed [S5][S8].
Cost-wise, hand-tie woven cord is competitive at low throughput: the 1/2 in. × 650 lb SKU at 84 USD per coil and the 3/4 in. × 2,400 lb SKU bracket the entry-level range [S2]. A heavier 3/4 in. × 3,000 lb SKU covers loads that would otherwise need a 3/4 in. steel band, and per-foot pricing lands near 0.05 USD/ft at the 1,650 ft coil size [S2][S3].
Safety and surface damage profile favor both non-metallic options over steel: woven cord will not rust, stain, or scratch painted surfaces, and PET band is similarly inert [S3]. For export crating where banding survives ocean humidity and weeks of outdoor staging, the corrosion-free property is the deciding factor more often than the headline break number.
Standards, Buckle Compatibility, and Failure Modes to Watch
Woven cord and PET band are not governed by a single North American performance standard in the same way steel strapping is; selection leans on manufacturer break-test data and internal load-securement rules (the WSTDA / industry strap tables referenced by most US distributors) [S5]. ASTM D4675 covers common plastic strapping test methods, and it is what most US catalogs cite for plastic strap performance, even when the headline test is a manufacturer break rather than a third-party cycle test [S5].
The two failure modes that catch operators out: woven cord that has absorbed a severe shock and is left in service without re-tensioning (it will creep further under sustained vibration, and the buckle joint is the first place to slip); and PET band applied to a load that is still settling, where the low elongation means any further compression shows up as a loose strap within hours, not days [S6][S8].
For plants that ship export loads through a container yard, the bulk bag and carton box references document how woven cord typically pairs with FIBC and corrugated secondary packaging on heavy industrial freight.
Selection Criteria in One Pass
Pick woven polyester cord strapping when the load is irregular, hand-tied, likely to shift in transit, and outdoor-staged long enough that rust or staining from steel is unacceptable; match it to phosphate-coated buckles sized to the strap width [S4][S7].
Pick polyester (PET) strapping band when the load is rigid, palletized, run through a powered tensioner/sealer, and stored or shipped for long periods where creep is the dominant risk; match it to serrated or closed metal seals rated for the strap width [S5][S8]. A related walkthrough of how these two fit alongside steel and polypropylene is on the Steel, Polyester, Cord and Woven Strapping: Material Selection Guide for 2026 Shippers page.
For a yield-versus-cost cross-check on the polypropylene alternative, see the PP vs PET Strapping: Meters per Kilogram Yield Compared reference.
Trackable signals over the next sourcing cycle: whether distributors start publishing WSTDA-aligned system break data (strap + buckle) rather than strap-alone break for woven cord, and whether cord SKUs in the 3,000 lb class add a third width option (1 in.) to close the gap with light steel banding.
