A direct weight-to-length yield check shows PET strapping returns roughly 0.3 the linear meters per kilogram of PP strapping at comparable width, because PET runs at higher break force and tighter elongation specs [S2]. A verified 19 × 1.0 mm PET grade lands near 10.7 m/kg against a 9 × 0.6 mm PP grade at 33.8 m/kg from the same Jushuo product program [S2].
PP remains the lower-density, lower-cost workhorse for light indoor loads up to about 270 kg break force, while PET replaces steel for heavy pallets above 300 lb thanks to its higher break force (up to 1360 kg) and ≤10% elongation [S1][S2][S3]. Equipment selection matters: switching materials typically means switching friction-weld versus heat-seal tooling, so the material call is also a tooling call [S3].
Linear yield: meters per kilogram, PP vs PET
Yield is the metric that decides roll count, changeover frequency, and pallet cost, and the gap between materials is mechanical, not vendor-driven. In the Jushuo program a 19 × 1.0 mm PET strap (break force 920 kg, 1100 m roll) works out to roughly 10.7 m/kg, while a 9 × 0.6 mm machine-grade PP strap (break force 90 kg, 3000 m roll) yields about 33.8 m/kg [S2]. The PET material runs at ~1.38 g/cm³ density, PP at ~0.91 g/cm³, so even a thin PET strap weighs more per running meter than a thicker PP strap at equal width.
Practical rule from the spec sheets: doubling PET break force roughly halves the meters-per-kg of a comparable PP roll, because cross-section grows faster than the strength gain [S2][S3]. For procurement, that means a single 19 mm reinforced PET coil can replace two to three PP coils on heavy-pallet lines, which is where the total-cost-of-strapping argument for PET starts to show up [S7].
Break strength and tension retention compared
PET strapping reaches break force of 160–1360 kg across the 9–25 mm Jushuo width range, with reinforced grades holding elongation ≤6% and standard grades ≤10% [S2]. PP strapping in the same vendor program covers 45–270 kg break force at 14–50% elongation, with machine-grade PP held at ≤20% [S2][S3].
Tension decay is the second performance gap. PP loses roughly 50% of applied tension within 1–2 hours of application, which is acceptable for short, stable indoor moves but disqualifies it from long-haul or extended-storage pallets [S3]. PET holds tension across the transit window and recovers from impact loads through its low elongation behavior, which is why it shows up on steel coils, aluminum ingots, lumber, brick, and glass pallets [S2]. The temperature window reinforces this split: PET is rated for service across roughly -30°C to 80°C (-22°F to 176°F) and resists UV, while PP degrades under UV and temperature extremes and is sized for short-term indoor use [S3][S5].
Decision matrix: PP, PET, and steel-substitution fit
Buyer decision should run on four criteria: load weight, elongation, total cost, and equipment compatibility. On those axes, PP fits light-to-medium loads under about 270 kg break force, with high elongation (14–50%) absorbing shock but losing tension over hours [S2][S3]. PET fits heavy and rigid loads above 300 lb, with low elongation (≤10%) and high tension retention across long transit or outdoor storage [S1][S3]. Steel strapping remains the fallback only for the highest-break, sharpest-edge applications where PET cannot match the tonnage; PET is otherwise positioned as the safer, lighter steel replacement at one-sixth steel's density [S2].
Compatibility is a tooling boundary, not a marketing footnote. PP embossed strap pairs with friction-weld tools, while flat PP pairs with heat-seal tools, and machine-grade PP rolls are built for automated heads; PET strapping is generally compatible with automatic and semi-automatic strapping heads including the embossed JS09400–JS19190 model family [S2][S3]. Switching materials on an existing line normally means re-tensioning settings and verifying seal-jaw temperature, not just swapping rolls [S3]. For a deeper look at steel-side sizing before you rule it out, see the steel strapping sizes 12.7–31.75 mm width, thickness and break strength reference.
Use-case recommendations by load profile
For e-commerce parcels, newspaper bundles, food cartons, and consumer-goods palletizing under 100 kg per strap, PP is the right call: low cost, easy handling, ~33.8 m/kg at 9 × 0.6 mm, and 90 kg break force covers the load envelope [S1][S2][S5]. For construction-materials pallets (timber, bricks, stone blocks), metal and aluminum coils, glass pallets, and export shipments, PET is the right call: 160–1360 kg break force, ≤10% elongation, and verified UV/moisture resistance [S2][S3][S5].
The dividing line sits around 300 lb per strap in field guidance [S1]. Below that line PP is the cost winner; above it, the cost of strap breakage, re-strapping labor, and rejected export containers quickly erodes the PP price advantage, and PET becomes the lower total-cost-of-strapping option despite the higher per-roll price and the lower meters-per-kg yield [S3][S7]. This same trade-off, lower material yield in exchange for higher functional performance, is exactly the pattern you see when comparing dry-type vs oil-filled transformer lead-time and cost decision matrix for heavier industrial builds.
Equipment, seal, and process constraints
Three process constraints decide whether a roll will actually run on your line. First, core and OD: Jushuo PET rolls ship on a 406 mm core with roll lengths 550–3800 m, so existing dispensers must clear the core and accept the OD [S2]. Second, seal method: embossed PET and embossed PP both work with friction-weld sealing, while flat PP needs heat-seal jaws set for the right temperature window [S3]. Third, tensioner calibration: because PP loses about half its tension in 1–2 hours, tensioners are typically set higher at application, which is a different setting from PET lines that target a stable, lower target tension [S3].
Recyclability is a fourth, softer constraint. Both PP and PET are recyclable, and PET can be sourced with recycled content; this matters for brand-owner sustainability mandates but rarely overrides the load-driven material choice [S2]. The reference strapping band encyclopedia page collects the spec families side by side for cross-checking before any tooling change.
Cost model: per-kg strap vs per-shipment strap
Per kilogram of strap, PP is cheaper; per secured shipment, PET often wins. PET delivers roughly twice the tensile strength of PP at the same width, so fewer straps per pallet, fewer re-strapping events, and lower labor cost offset the higher per-roll price on heavy-pallet lines [S7]. The break-even sits near the load classes where PP elongation and tension decay start causing visible load shift, broadly the 300 lb per strap threshold noted in field guidance [S1][S3].
For lines strapping hundreds of lightweight cartons per hour, the meters-per-kg advantage of PP (around 33.8 m/kg at 9 × 0.6 mm versus 10.7 m/kg at 19 × 1.0 mm PET) compounds into longer roll runs and fewer changeovers, which is why PP still holds an estimated 46.6% share of the global strapping materials market by 2022 data [S2][S3]. Choosing between strapping machine types and the right band is one decision, not two, and the band choice drives the head, tensioner, and seal-jaw spec.
Limitations and failure modes to plan for
PP failure modes are well documented: tension loss within 1–2 hours, UV-driven embrittlement in outdoor storage, and snap under sustained high compression [S3][S5]. PET failure modes are different and less intuitive: poor seal-jaw setup can cause the strap to pull through the seal under impact, and the higher stiffness of reinforced PET can bruise soft cartons if applied without edge protection [S2][S3]. Both materials lose performance at extreme temperatures outside their rated window, so any spec sheet for a cold-chain or tropical-dock application should be checked against the operating temperature range rather than the room-temperature break number.
Track these signals going into the next procurement review: the ratio of re-strapping events to total shipments (rising PP re-straps point to misapplied material), the seal-jaw temperature log on PET lines (drift indicates worn heater elements), and the meters-per-kg figure on each incoming roll (a drop against the reference 10.7 m/kg for 19 × 1.0 mm PET or 33.8 m/kg for 9 × 0.6 mm PP is a spec-change flag worth a vendor conversation) [S2][S3].
Spec-level background on the components involved: pressure transmitter.