Start with the buying target, not the weight
For economy-cabin sourcing, 170gsm sits in the usable middle of the airline-blanket range: light enough to protect cube and freight economics, heavy enough to avoid the brittle handfeel of very low-GSM fleece. The commercial decision is not just nominal weight; it is whether the blanket is intended for short-haul amenity use, longer-haul comfort, lounge turnover, or a route-specific programme that also needs flame-retardancy review.
Write the product definition in procurement language. Example-only target: finished fabric weight 170gsm +/- 5 percent at bulk, 100 percent polyester, finished size 100 x 140 cm or 110 x 160 cm as agreed, folded size no more than 18 x 24 x 3 cm, packed by route in a fixed carton configuration. If the supplier only quotes a generic '170gsm fleece blanket' and cannot state whether that weight is greige, post-brush, or finished, the quote is not ready for comparison.
Scope note: these constructions are not interchangeable
Do not treat fleece, microfleece, and tricot-backed structures as one SKU family. They behave differently in curl, linting, and packing, even when the printed GSM looks similar. A brushed fleece usually gives more loft and softer hand; microfleece packs flatter and tends to show less bulk growth; a tricot-backed style can improve surface stability but may change drape and seam behaviour.
Use a decision rule before you request samples. If the programme prioritises compact pack and lower lint, start with microfleece. If it prioritises a warmer hand and less transparency, start with brushed fleece. If the brief requires a cleaner edge line or more stable print registration, evaluate a tricot-backed option separately. Do not let the factory substitute one construction for another without written approval. For a closely related brushed-fleece construction, see 140gsm brushed polyester airline blankets with heat-cut edges.
Fabric build: pin down the inputs that affect bulk performance
Ask for three fabric facts on every sample submission: yarn denier, knit gauge, and finishing route. For this class, yarns around 50D to 75D are common examples, but that is a buyer-requested target range rather than a universal standard. A 28G to 32G knit is often used for a lighter fleece hand, while a looser structure can feel bulkier and show more growth after compression or laundering.
Also ask for the finished width on the loom or circular machine, the brushing direction, and whether heat-setting was applied before or after brushing. Those details explain why two blankets that both claim 170gsm can handle differently. If the supplier says denier is not applicable, they should still provide yarn construction and knit structure so you can compare lot-to-lot behaviour.
Seam construction: specify the stitch, not just the style
Flatlock or low-bulk cover-style construction is usually preferred because it reduces ridge height and improves stackability. But seam appearance is not enough. A seam that looks tidy at PP can still tunnel, rope, or flare once it goes through compression and handling cycles, especially if thread tension or feed balance drifts on bulk production.
Put the seam spec in measurable terms: stitch class, thread type, stitch density, seam allowance, and thread colour. Example-only target: polyester sewing thread in the 150D to 180D range, with stitch density around 8 to 12 SPI equivalent depending on machine setup and operator control. Define the failure trigger in the PO: any seam opening, seam grin, or visible distortion beyond 3 mm at the edge after one wash and one compression cycle is a major defect. If the blanket is sold into harsher handling environments, use a wider seam allowance or a self-fabric bind rather than relying on a narrow flatlock alone.
Edge curl: define the limit before production starts
Edge curl is the most common reason a blanket looks cheap even when the fabric itself is acceptable. It usually comes from imbalance between cut direction, knit memory, brushing direction, and heat-setting. A light polyester blanket can pass a hand-feel check and still curl enough to reduce usable width by several centimetres after folding or laundering.
Do not leave curl as a subjective comment in approvals. Put a measurable target in the spec: no corner curl greater than 15 mm from flat when the blanket is laid unweighted on a table after conditioning; no progressive curl that reduces finished width by more than 2 percent after the agreed laundering cycle. If the construction is heat-cut, make the supplier prove edge stability on the actual bulk fabric, because heat-cut edges behave differently on soft brushed faces than on tighter knits. A wider hem, edge stitch, or self-fabric binding is more forgiving than a bare heat-cut perimeter.
PP sample approval versus production release
Keep pre-production approval, first lot release, and ongoing inspection separate. PP sample approval answers one question only: does the proposed construction, size, and packing concept match the brief? First lot release answers a different one: did the factory reproduce the approved sample using the intended bulk materials and process settings? Ongoing inspection asks whether later lots stayed inside the same control window.
Use different gates for each stage. PP approval should cover fabric hand, construction, label layout, packing mock-up, and test submission on the submitted sample. First lot release should verify finished size, GSM, seam appearance, colour consistency, carton fit, and agreed documentation against actual bulk cartons. Ongoing inspection should be tied to lot numbers, not a generic pass/fail on the programme as a whole. Mixing these stages is how a buyer approves a sample that the factory cannot hold in production.
Acceptance checklist for sample approval
A useful comparison sheet is operational, not descriptive. Measure the same items for every PP sample: finished size, measured GSM, folded size, seam flatness, curl at all four corners, pilling after laundering, lint release, and carton fit. If one sample feels softer but also packs thicker, write that down; the freight impact can outweigh the comfort gain.
Use this as a pre-production gate before bulk release: finished size within +/- 2 cm on the short side and +/- 3 cm on the long side, GSM within +/- 5 percent of target, no visible seam opening, and no edge distortion that would block carton loading or amenity-cart stacking. If the approved sample cannot meet those numbers consistently, the sourcing problem is upstream in construction control, not inspection. A broader QC framework is outlined in blanket quality control inspection.
Testing that matters, with usable acceptance criteria
Testing only helps if the lab order is specific. For 170gsm polyester airline blankets, request ISO 12945-2 for pilling, ISO 6330 for laundering, ISO 5077 for dimensional change, and a seam strength method such as ASTM D5034 or an equivalent buyer-agreed internal seam test. If the product behaves like a very low-loft textile, lint release can also be checked using ISO 9073-10, even though the blanket is not a nonwoven by construction.
State the method details in the purchase spec. For ISO 6330, specify wash cycle, temperature, detergent type, load size, and number of cycles; a common buyer programme uses one or five domestic cycles at 40 C, but that is a procurement target, not a universal standard. For ISO 5077, state specimen orientation, preconditioning, and whether the test is on warp-knit, weft-knit, or cut-and-sew fabric. For ISO 12945-2, specify the apparatus setting and number of cycles, then record both face and edge appearance. For seam testing, state the failure mode explicitly: peak seam force to rupture, or seam slippage at a defined extension, or seam opening under load. Do not accept a generic 'buyer-defined minimum load' without naming the metric and unit.
Example-only acceptance targets that many buyers use for this category: pilling grade 3.0 or better after the agreed wash cycle, dimensional change within +/- 3 percent in both directions, and no seam rupture below the agreed minimum peak force for the construction class. If the criterion is seam slippage, define it in millimetres at the measured force; if the criterion is rupture, define the Newton value and the point of failure. Require the report to reference the exact fabric, exact colour, and exact lot; a similar style report is not proof.
Compliance file: baseline, conditional, and airline-specific items
Separate what you always request from what only applies in certain programmes. Baseline file items usually include fibre composition declaration, care-label basis, AQL inspection result, and a restricted-substance statement covering the current buyer requirement set. If the blanket is sold into an EU-facing channel, REACH SVHC disclosure is normally requested. If any water-repellent, soil-release, or hand-feel finish is used, ask for PFAS disclosure and the chemistry route used on the bulk fabric.
Flammability evidence is conditional on route, carrier, and channel. Some airline programmes require a named standard, such as FAR 25.853 or an operator-specific flame test; others do not. Do not assume polyester alone is sufficient. If the route or buyer brief names a flammability requirement, state it explicitly in the PO and require the tested construction to match bulk production, including labels, print, seam tape, and any finish that could alter burn behaviour. For airline supply, also confirm country-of-origin marking on the product or packaging as required by destination market rules, care-label language in the shipment language set required by the buyer, and any operator-specific packaging marks such as route code, cabin class, shelf-life lot code, or handling symbol. Those controls are small but they drive receiving compliance.
Packing economics: use a worked carton example
Packing is part of the product, not a warehouse afterthought. State the fold format, bundle count, inner pack type, carton dimensions, gross weight limit, and pallet pattern if palletised. Example-only carton case: a 100 x 140 cm blanket may be folded to roughly 18 x 24 x 3 cm, packed 40 pieces per outer carton, with a carton around 50 x 35 x 30 cm. That carton is about 0.0525 cbm before compression and board tolerance are considered. At 40 pieces, the gross weight often lands in the 9 to 12 kg range depending on fabric density and packaging materials.
Use carton engineering to compare suppliers like for like. A quote with 48 pieces per carton may look efficient until the carton exceeds a handling limit or the board grade fails in transit. Write the packing spec with enough precision to be audited: folded dimensions, inner pack type, barcode placement, carton board grade, gross weight limit, and pallet layer count. If the buyer is planning mixed-SKU consolidation, ask the supplier to confirm the maximum carton height and outer case strength before the PO is released. For broader shipping logic, see custom blanket lead times and shipping.
FOB Shenzhen: what is in the price, and what is not
FOB Shenzhen means the supplier price includes the goods, factory handling, inland movement to the named port, export customs clearance, and loading on board the vessel at Shenzhen. It does not include ocean freight, marine insurance, import duty, destination handling, port storage at destination, or inland delivery after arrival. If the quote folds any of those costs in, it is no longer a clean FOB comparison.
For buyer-side comparison, break every quote into the same buckets: fabric, knitting or finishing, cutting and sewing, seam setup, labels, packing materials, cartonisation, export documents, and port charges inside FOB. Then compare that against EXW and CIF on a landed basis. EXW excludes export handling and port movement, so it often looks cheaper until the buyer adds trucking and customs work. CIF includes freight and insurance to the named destination port, but destination charges still remain outside the price. A proper comparison is same volume, same packing spec, same inspection standard, same payment term, same Incoterm. If those differ, the numbers are not comparable.
If a supplier’s FOB Shenzhen price is unusually low, check for hidden reductions in seam time, thread quality, carton grade, or inspection frequency. Those are the usual places where a low quote is lost during scale-up.
FOB quote field list
Use one short request template so every supplier answers the same way. The minimum fields should be: composition, construction, finished size, tolerance, packing method, carton spec, compliance docs, and lead time. Add model code, colour, logo method, and intended Incoterm so the factory cannot answer loosely.
Example-only FOB Shenzhen quotation template: 1) product description: 170gsm polyester airline blanket; 2) composition: 100 percent polyester; 3) construction: brushed fleece or microfleece, named by supplier; 4) finished size: 100 x 140 cm; 5) tolerance: +/- 2 cm short side, +/- 3 cm long side; 6) packing method: 1 piece in polybag, 40 pieces per carton; 7) carton spec: 50 x 35 x 30 cm, gross weight no more than 12 kg; 8) compliance docs: composition declaration, care label, test report, AQL result, restricted-substance statement, and any flammability record if applicable; 9) lead time: PP sample, bulk production, and ETD window; 10) Incoterm: FOB Shenzhen. If the supplier cannot answer these fields cleanly, the quote is not procurement-ready.
Buyer-side comparators for landed cube and loadability
Do not compare fabric only. For FOB quoting, you also need carton dimensions, cartons per 20'GP and 40'HQ, and a tolerance on net and gross carton weight so you can compare landed cube rather than just textile cost. This matters because a blanket programme with a good FOB price can still lose on cube if cartons are oversized or overpacked.
As a practical reference, buyers often ask for carton dimensions that keep the gross weight between about 9 and 12 kg for hand handling, with carton weight tolerance within +/- 0.3 kg on net and gross measures for lot control. Cartons per container depend on final cube, but the supplier should state the loading assumption used for their offer, not leave it to the buyer to infer. If a factory cannot tell you the carton count per 20'GP and 40'HQ for the quoted pack, they are not giving you a landed-cost comparable quote.
Inspection levels and defect logic
Use AQL as a lot control tool, not a substitute for specification. For airline blankets, a common buyer structure is to separate critical, major, and minor defects, then attach the acceptance limit to each class. The exact AQL depends on route and buyer risk appetite, but the important point is to name the defect classes in the PO and inspection plan.
Critical defects are items that break compliance or use: wrong fibre content, missing care label where required, failed flammability evidence where applicable, severe contamination, or carton mislabelling. Major defects are those that stop normal cabin use: seam opening, hole, gross size out of tolerance, or clear packing mismatch. Minor defects are cosmetic or low-risk presentation issues such as light loose thread, small shade variation within approved range, or slight fold mark outside the visible face. Tie the defect class to the inspection stage so sampling is not interpreted differently by different factories.
What to hold in the purchase order
The PO should not rely on a catalogue title. Hold the following line items in the order: fabric weight target, finished size, construction type, seam method, packing format, carton dimensions, carton weight limit, required test reports, AQL level, and the approval reference for PP sample and bulk colour. If any item is left blank, the factory will fill it with its default process and you may not get the same article that was quoted.
Include a release rule for production lots: bulk must match the approved sample for fabric, construction, finish, label layout, and packing; first lot release must be signed off before repeat production; any change in yarn, brushing route, seam thread, carton spec, or outer pack requires written re-approval. That is a small amount of paperwork compared with a rejected airline rollout.
Frequently asked
What is the most useful spec when comparing 170gsm airline blankets? Finished performance matters more than nominal weight. Compare finished size, construction type, seam method, edge stability, packing cube, and the test results attached to the exact bulk lot. GSM is only one input.
Should PP sample approval and bulk release use the same criteria? No. PP approval checks whether the proposed construction and packing concept match the brief. Bulk release checks whether production reproduced the approved sample in actual factory output. They should be separate gates.
What seam criterion should I ask for? Name the failure mode and unit. Use either peak seam force to rupture in Newtons, or seam slippage measured in millimetres at a defined load. Do not accept a vague minimum load without the metric.
How should carton economics be compared across suppliers? Ask for carton dimensions, pieces per carton, gross weight target, carton weight tolerance, and cartons per 20'GP and 40'HQ based on the quoted pack. That lets you compare landed cube, not just fabric cost.
What compliance items are worth holding for airline supply? At minimum: fibre composition, care-label basis, restricted-substance statement, AQL result, and any required flammability report. For airline programmes, also confirm country-of-origin marking, care-label language, and any operator-specific packaging marks.
Is FOB Shenzhen enough for a final landed comparison? No. FOB lets you compare supplier-side manufacturing and export costs. To compare total cost, you still need ocean freight, insurance, destination handling, duty, and inland delivery at the receiving market.
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