A 12 mm PP strapping roll and a 12 mm PET strapping roll can differ in break strength by a factor of 2.5 to 3, yet most Chinese suppliers list both under the same width code [S1][S2]. On an MCC panel RFQ, that ambiguity is the single biggest reason a procurement team receives four quotes that are not comparable, and is the first thing the receiving desk should lock before asking for price.
The cheapest export roll in the 2026-08-09 Made-in-China index is a 12 mm wide OPP banding tape at US$ 2.50-2.88 per piece (MOQ 1) [S2], while a factory-price PP strapping roll in the same width sits at US$ 14.00-20.00 per roll [S1]. Spread of 5x to 6x for the same nominal application confirms why a generic "strapping band" line is not a buyable spec. The seven fields below turn it into one.
Material and resin grade: PP vs PET vs OPP, the first gate
PP (polypropylene) strapping is the default for loads under about 200 kg and is the resin most frequently quoted by Made-in-China Diamond suppliers in 2026-08 listings, at US$ 14.00-20.00 per roll for 12 mm width [S1]. PET (polyester) strapping targets higher break strength at the same width, runs through dedicated extrusion lines with variable-frequency drives [S4], and is the correct choice when the MCC panel crate weight exceeds roughly 200 kg or when the strap must hold on a timber crate through a 6- to 8-week sea-freight leg. OPP banding tape (oriented polypropylene) is a paper-thin money/carton strap, listed at US$ 2.50-2.88 per piece for 12 mm width and 0.12 mm thickness under code OPP-12-40-0.12 [S2], and it should never be specified for crate duty; the supplier will accept the line, the strap will fail in transit, and the requote cycle starts again. Write the resin acronym in full on the RFQ line; do not let the buyer abbreviate to "plastic strap".
Width, thickness, and break strength: the three numbers that pin the price
Common industrial widths in the 2026 Made-in-China index are 9 mm, 12 mm, 15 mm, 16 mm, 19 mm and 25 mm, with 12 mm and 16 mm dominating MCC-crate quotes [S1]. Thickness is the second gate, and the supplier catalogue for OPP banding tape uses a thickness-coded suffix (the "-0.12" in OPP-12-40-0.12) [S2]; for PP and PET crate strap, thickness typically runs 0.4 mm to 1.0 mm. Break strength is the third gate: a 12 mm PP strap at 0.6 mm typically breaks at 90-180 kg, a 12 mm PET strap at 0.6 mm typically breaks at 230-380 kg, and a 16 mm PET strap at 0.8 mm pushes past 450 kg. Write the three numbers as "W x T, break = N daN" on the RFQ line, not as separate questions. If you only write width, the supplier picks the cheapest thickness in stock and the line item silently becomes a different product [S1][S2].
Core, roll geometry, and pallet-pack compatibility
Core inner diameter for hand-grade PP and PET strapping is 200 mm (8-inch) in most 2026 export lines, with 406 mm (16-inch) cores used for machine-grade jumbo rolls fed into a strapping machine. On the RFQ, lock roll length, core ID, and outside diameter together; an OD over 600 mm will not fit a standard crate-side dispenser and the receiving dock will stack the roll incorrectly. The winder stage on the extrusion line uses servo-controlled displacement and computer-set winding width per strap spec [S3][S5], so the producer can hit the roll geometry you write; the question is whether you wrote it.
Surface, conductivity, and special-environment gates
Standard strapping has an embossed or smooth matte surface; for ESD-sensitive MCC panel sub-assemblies, a conductive strapping variant is a separate product line supplied by cleanroom-bag manufacturers (Alibaba lists 100 suppliers in this niche, with Malaysia flagged as a primary source) [S9]. For export crates that pass through tropical ports or 6-week ocean transit, request UV-stabilised resin and a printed lot code on the core, which lets you trace the extrusion batch if a strap fails. Conductive and UV-stabilised options typically carry a 15% to 40% price premium over commodity PP, and they are never the default quote, so omitting the gate means you receive the commodity price for a non-commodity duty.
RFQ line template: seven fields, one line, no requote
The minimum buyable strapping band line on an MCC panel RFQ should read, in this order: (1) resin (PP / PET / OPP), (2) width in mm, (3) thickness in mm, (4) break strength in daN or kg, (5) core ID in mm, (6) roll length in m, (7) pack/panel weight in kg and annual volume. An example that locks the price: "PET strapping, 16 mm x 0.8 mm, break >= 450 kg, 406 mm core, 1500 m/roll, for 280 kg MCC panel crates, 12000 m/yr". A buyer who writes that line gets three or four quotes that are directly comparable; a buyer who writes "strapping band for MCC" gets three or four quotes that differ in resin, width, thickness and strength, and the eval cycle resets. The full strapping band reference spec and the matching MCC panel enclosure spec should be attached as PDF to keep the resin and the crate geometry in one document. [S3]
Common spec mistakes that trigger requote cycles
Each of these is a single missing field; the cost of fixing them on the original RFQ is one line of typing, and the cost of fixing them after the PO is a 2- to 6-week delay. For higher-volume panel plants, integrating the strap spec into the same sourcing review as the panel enclosure hardware and the related packaging-line equipment (see also this roller bearing selection for packaging lines spec map) catches the geometry conflicts before the PO is cut. [S1]
Trackable next signal: confirm by 2026-09-15 whether your top three strapping suppliers publish a per-roll data sheet listing resin, width, thickness, break strength, core ID and roll length on a single line, because suppliers that publish all six on one line (rather than across three tabs) consistently return faster, more comparable quotes on panel-crate RFQs.