Define 600gsm correctly before you discuss price
For this article, 600gsm means usable finished blanket body mass per square metre, measured on the woven body after finishing and conditioning, excluding fringe and excluding packaging. Keep that definition unchanged throughout the PO. If you switch between body GSM and total finished article weight, disputes are almost guaranteed.
For woven emergency blankets, the practical route is: condition samples to ISO 139, then determine mass per unit area by ISO 3801 from specimens cut from the finished woven blanket body. ISO 3801 is suitable here because this is a woven textile blanket body, not a bonded picnic mat, foam laminate or lofty filled article. Sample from at least 3 blankets per lot up to 10,000 pieces, taking 5 body specimens per blanket across left, centre and right areas away from hems, labels and fringe. Report lot average GSM and individual specimen range.
The piece-weight maths should be stated separately. A 150 x 200cm blanket gives a commercial body area of 3.0m². At 600gsm body mass, theoretical body weight is 1.80kg. Finished article weight will then move with hem construction, fringe, label, and moisture regain. A workable specification is: finished blanket body mass 600gsm ±5% on lot average by ISO 3801 after ISO 139 conditioning; no individual body specimen below 570gsm or above 630gsm. Then add a separate line: finished piece weight target 1.80kg for body-only equivalent; actual finished article weight to be declared by edge construction, with individual blanket tolerance ±7% and lot average ±5%.
If the style is hemmed on four sides, piece weight commonly lands 20-80g above theoretical body weight because folded hems add material. If the style is fringed on two sides, finished article weight may sit 10-60g below the body-equivalent figure because fringe reduces retained woven area. Write the edge construction into the spec so the weight expectation is not left open.
Do not use the same weight logic for nonwoven, felted or needle-punched products. Those articles can have different area stability, different edge integrity and different failure modes. A woven recycled wool-blend emergency blanket should be specified as a woven finished article, not grouped together with needle-punched felt picnic rugs or other nonwoven constructions.
Use the right test method for the actual article
Standards should match the blanket form, not just sound technical. ISO 3801 is appropriate for woven blanket body GSM. ISO 11092 is a guarded hotplate method developed for steady-state thermal resistance and water-vapour resistance of textile materials. It can be used on blanket material if the lab can mount the specimen flat and report the setup clearly, but it is not a direct 'how warm a finished emergency blanket feels outdoors' test. If you request it, specify single-layer specimen from finished blanket body, conditioned to ISO 139, no folding, no compression beyond the test fixture, report Rct in m²·K/W.
For fibre composition, do not cite the ISO 1833 family as if one part covers every recycled blend. The correct wording is that the testing laboratory must select the applicable ISO 1833 part for the declared wool/synthetic combination and may need supporting microscopic identification because recycled fibres can be damaged, blended irregularly, or contaminated with non-textile matter. That is more accurate than citing ISO 1833 broadly without qualification.
For strength, use methods that fit woven textiles. ISO 13934-1 strip tensile suits the woven blanket body. For tear resistance, Elmendorf-type tear methods such as ISO 13937-1 are more relevant than seam-only methods if your concern is edge propagation or broken picks in the body. For wash dimensional change, use ISO 6330 with the exact domestic laundering programme written into the PO. For pilling, ISO 12945-2 is a practical route for wool-blend surfaces. For crocking on dark melange shades, an agreed rubbing test such as ISO 105-X12 can be added if colour transfer is a concern.
If you do not need a thermal lab claim, say so plainly. Many emergency programmes use mass, size and fibre blend as the commercial buying basis and skip ISO 11092. That is acceptable if the PO states: no independent thermal-resistance claim required; acceptance based on mass, dimensions, composition and durability criteria only. Buyers comparing lighter relief options can benchmark freight and handling differences against 180gsm polyester fleece blankets for disaster relief or 250gsm polar fleece emergency blankets, but this article stands on its own for the 600gsm wool-blend specification.
Lock fibre composition, recycled-content proof and contamination rules
Do not buy on a phrase like 'wool blend' alone. State the composition as a contractual floor with a dispute tolerance. A practical stock-spec line is: fibre composition minimum 60% wool by mass, balance recycled polyester and/or recycled acrylic; measured result must not fall more than 3 percentage points below the contractual wool minimum. That means a 60% wool specification fails below 57%. If the programme allows a lower wool floor for cost reasons, write that explicitly, for example minimum 55% wool.
Recycled-content claims need evidence beyond fibre testing. A usable buyer requirement is: minimum 80% recycled input overall by mass, supported by lot-specific evidence consisting of supplier declaration, incoming batch traceability, production lot record, and where available transaction certificate or third-party chain-of-custody record matching shipment quantity and dates. Documentation alone should not be generic. It should tie to the actual PO number, lot number, batch weight and shipment date.
For mixed recycled inputs, require a batch trace pack. At minimum, ask for: yarn or fibre lot IDs, internal batch cards, bale or carton coding, supplier declarations for recycled raw material, and shipment-level packing list that maps lot numbers to carton or bale counts. If a third-party recycled claim is commercially required, the shipment paperwork should show the claim percentage and transaction reference that matches the invoice quantity. This is the practical control point behind general recycled sourcing guidance such as sustainable recycled blanket sourcing and recycled-claim documentation buyers ask for.
Recycled wool emergency stock has failure modes that are specific to garnetted feedstock. Buyers should control metal contamination, sharp foreign matter, foreign fibre streaks, humid-storage odour, and bale-to-bale melange drift. A workable contamination line is: 0 tolerance for metal fragments, needles, wire, glass, stones, hard plastic shards and other sharp foreign matter; 0 tolerance for visible oil stains or mildew; no soft contamination piece over 5mm on the blanket face; dark speck count above 2mm not to exceed 5 per 30 x 30cm zone and not more than 20 per blanket. If metal contamination is a concern, require 100% inline metal detection where practicable for folded finished pieces, with reject log retained by the supplier.
Odour needs an explicit threshold because humid-stored recycled wool can pick up stale, smoky or mould-like notes. A usable requirement is: odour grade maximum 3 on a 1-5 internal scale assessed within 5 minutes of opening the bale or carton at ambient conditions; no mildew, burnt, solvent or rancid-oil odour permitted. For relief programmes shipping into humid climates, add carton or bale moisture-protection liner required and a dispatch condition of dry goods only, no evidence of condensation or wet pallet exposure at handover.
Distinguish woven emergency blankets from needle or nonwoven articles
A woven recycled wool-blend blanket and a nonwoven or needle-punched article should not share the same acceptance logic. Woven blankets fail through broken yarns, missing picks, weak selvedges, fringe pull-out, seam cracking and shade barring. Needle-punched or felted articles fail more through edge dusting, thickness non-uniformity, needling marks, delamination of added layers, and lower definition of warp/weft strength.
For a woven emergency blanket, edge integrity should be specified by construction. Preferred options are 4-side folded hem 25-35mm depth, lockstitch seam or 2 woven selvedges plus 2 hemmed ends. If fringe is required, state finished fringe length 40-60mm with secure anchoring and define whether fringe is excluded from the commercial size and GSM calculation. Avoid vague phrases such as 'standard finishing'.
If a supplier proposes a stitched blanket made from reclaimed fibre sheet, ask whether the product is truly woven, needled, or bonded. The answer changes which test results are meaningful. Woven-body GSM by ISO 3801 and strip tensile by ISO 13934-1 are sensible for woven blankets; they are less useful as standalone controls on bulky nonwoven mats or multi-layer picnic constructions such as camping ground mat construction or picnic blanket backing systems.
This distinction matters commercially. A buyer paying for a 600gsm woven wool-blend blanket should not accept a product that reaches weight through loose nonwoven bulk but gives inferior edge life, higher lint fallout and weaker handling durability. Write construction: woven blanket body into the PO, not only GSM and size.
Set measurable acceptance values, not descriptive promises
A buyer-facing specification should cover dimensions, tensile, tear, washing stability, pilling, linting, odour, shade and contamination with numeric pass/fail rules. A practical starting point for a 150 x 200cm woven emergency blanket is: finished size tolerance ±3% in length and width after conditioning; no individual blanket below 145 x 194cm for a nominal 150 x 200cm item. State whether size is measured including hems and excluding fringe.
For tensile strength of the woven body, a workable benchmark is: ISO 13934-1 strip method, 5 specimens warp and 5 weft from finished conditioned blanket body; minimum average 350N warp and 250N weft; no individual specimen below 300N warp or 220N weft. If the yarn system is coarser and more open, buyers may relax the weft floor slightly, but that decision should be deliberate and priced accordingly.
For tear resistance, add a body-fabric requirement such as: ISO 13937-1 Elmendorf tear, minimum average 18N warp and 15N weft; no individual below 15N warp or 12N weft. This is not a luxury-retail threshold; it is a practical floor to reduce split propagation from rough handling, compressed bales and field distribution. If the blanket uses fringe ends, also add fringe pull-out or end-security check by agreed in-house method.
For washing stability, specify both the method and the number of cycles. A practical relief-grade line is: ISO 6330, one agreed domestic laundering cycle at the care-label condition; dimensional change maximum 5% length and 5% width for hemmed blankets, 6% on fringed styles. If repeated institutional washing is expected, require 3 cycles and reassess appearance, skew and handfeel. For premium programmes, some buyers target 3-4%, but many recycled wool-blend stock blankets will not hold that without price impact.
For pilling and linting, a realistic opening requirement is: ISO 12945-2 pilling minimum grade 3 after 2,000 rubs. For loose-fibre fallout, add an in-house visual rule: after one shake-out and refold on a black inspection table, no heavy lint accumulation and no loose fibre clumps over 10mm. If dark-clothing transfer is sensitive, add ISO 105-X12 dry rubbing minimum grade 3 on dark melange shades.
For shade tolerance, use an approved standard and define the unit of control. A practical line is: shade to approved sealed melange standard under D65 light source, lot average within grey scale 4 for shade change, no bale-to-bale drift visually exceeding half-step against the approved standard. Because recycled melange varies, also state whether approval is based on lab dip, loom-state swatch or finished blanket standard; the finished blanket standard is safer.
For odour, contamination and visual quality, keep the rules inspectable: odour grade max 3/5; 0 tolerance for sharp contaminants; no holes, no repairs without buyer approval, no obvious barring within 1 metre viewing distance, no broken hems, and no label omission. These items should sit inside an agreed AQL inspection plan, not outside it.
Sampling plan: make tolerances enforceable at lot level and unit level
Many blanket disputes come from weak sampling language. Buyers should specify how many blankets are tested, from where, and whether tolerance applies to lot average, individual units or composite lab result. Without that, both sides can cherry-pick data.
A practical inspection structure for commercial emergency blanket orders is: visual and workmanship inspection to AQL 2.5 using a recognised single-sampling plan, with cartons selected across the lot, not only from the top row. For example, on a lot up to 10,000 blankets, pull cartons from the beginning, middle and end of production or staging, and sample from at least the top, middle and bottom layers of selected pallets or bales. For compressed bales, open enough bales to avoid only seeing outer blankets.
For laboratory checks, use separate rules by property. GSM and dimensional tolerance should apply to individual blankets and lot average. Fibre composition can be assessed on a composite lab sample made from multiple blankets within the same lot, but if the result is near the contractual floor, a reserve sample from additional blankets should be tested. Odour, contamination and shade should be checked on individual units from multiple bales or cartons because those issues are often localised.
A workable minimum for one homogeneous lot is: 10 blankets for dimensions and workmanship, 3 blankets for GSM specimen cutting, 3 blankets for tensile/tear specimen cutting, and 1 composite sample made from at least 3 blankets for fibre analysis. For lots above 20,000 pieces or mixed production dates, increase the number of sampled cartons or split the lot by production batch.
Write the failure rule in plain language. Example: lot fails if lot-average GSM is outside tolerance, if any critical contamination defect is found, if AQL acceptance number is exceeded for major defects, or if laboratory composition falls below the agreed minimum minus tolerance. Buyers who need a ready QC backbone can align this with AQL 2.5 inspection checklist logic and blanket quality control inspection.
EXW means the pickup process has to be written, not assumed
On EXW terms, price may look simpler, but operational ambiguity shifts cost and risk onto the buyer. For blankets, the PO should define pickup readiness, export document pack, loading responsibility, palletization standard, packing list format and exact timing of risk transfer. If these are not written, a low EXW price can become an expensive collection problem.
A useful EXW readiness definition is: goods packed, counted, labelled, segregated by PO, export carton or bale count confirmed, final invoice issued, packing list issued, and pickup appointment accepted in writing at least 24 hours before collection. If the goods are not accessible for loading at the agreed time, the buyer starts paying truck waiting, warehouse coordination and rebooking costs. Write a readiness clause, not just a ship window.
State who loads. Under strict EXW logic, the buyer bears collection from the seller's premises, but many buyers still require the supplier to place goods onto the collecting vehicle using in-house labour or forklift. If that is expected, write it explicitly: supplier responsible for safe loading onto buyer-nominated vehicle at pickup point; loading included in EXW price / or charged separately. If the supplier will not load, say so in advance.
Require a packing list that can actually be checked at pickup. A workable format is: PO number, style code, fibre composition, nominal size, colour, edge finish, carton or bale sequence, quantity per carton or bale, gross and net weight per package, package dimensions, pallet count if palletised, and total shipment summary. For compressed bales, add bale straps count and liner type. For pallets, define whether they are non-returnable export pallets and whether top caps or stretch wrap are used.
Export documents should be named before collection. At minimum, buyers commonly ask for commercial invoice, packing list, factory release note, and if applicable origin statement or certificate requested by the import programme. If recycled-content proof is part of the contract, the claim-support documents should be available no later than pickup date. If fumigation, pallet declaration or carton marks are needed by the destination market, write that into the PO; EXW does not make those requirements disappear.
Risk transfer timing should be clear. If you buy on EXW, state whether risk transfers when goods are placed at the named pickup area before loading or only after loading onto the buyer's collecting vehicle if the parties agree that variation in writing. Many disputes start because the cartons are ready but exposed to rain during loading, or because pallet damage occurs before the truck departs. The PO should state who carries that risk at each step. Buyers comparing EXW with port terms may also want to review EXW versus FOB cost items and blanket lead times and shipping checkpoints.
Packing, bale compression and moisture control change claim risk
Emergency blankets are often shipped in export cartons or compressed bales. Compression saves cube but can worsen edge distortion, odour concentration, fibre set and carton burst risk on heavy wool-rich articles. For a 600gsm woven blanket around 1.75-1.95kg finished article weight, buyers should ask whether the supplier plans carton pack, strapped bale, or carton on pallet, then write the pack-out into the contract.
For carton shipments, a conservative starting point is 5-10 blankets per export carton depending on carton strength and destination handling. Carton gross weight should generally stay in a range many warehouses can handle safely, often around 12-22kg. Above that, burst risk and manual-handling issues rise. For bale shipments, require moisture liner plus outer woven or PE protection, and specify whether bales may be floor-loaded or must be palletised.
Heavy recycled wool articles should also have a moisture-control rule at dispatch. A practical clause is: goods must be packed dry, no wet finishing residual feel, no visible condensation inside liner, no rain exposure during staging or loading. If the supplier stages goods for pickup overnight, the staging area should be covered and off the floor. A small amount of absorbed moisture can distort weight, odour and mould risk before arrival.
Carton and bale marks should be operational, not decorative. Ask for PO number, style, colour, size, quantity, gross/net weight, carton or bale number and country of origin marking if required. If the programme is emergency relief, also add plain-language product identification in English or destination-language format agreed by buyer and avoid retail marketing copy.
Copyable PO and spec block for buyers
Below is a compact format buyers can paste into a purchase order or technical agreement and edit to suit the programme:
Article: Woven recycled wool-blend emergency blanket. Nominal size: 150 x 200cm finished, measured including hems and excluding fringe. Construction: woven body, 4-side folded hem 25-35mm depth / or 2 fringed ends 40-60mm finished fringe length. Mass basis: finished blanket body 600gsm ±5% lot average by ISO 3801 after ISO 139 conditioning, fringe excluded. Piece weight: supplier to declare finished article nominal weight by approved edge construction; lot average ±5%, individual blanket ±7%.
Composition: minimum 60% wool by mass, balance recycled polyester and/or recycled acrylic. Analytical rule: laboratory to use applicable ISO 1833 part with supporting microscopic identification where needed; measured wool content not below contractual minimum minus 3 percentage points. Recycled claim: minimum 80% recycled input overall, supported by lot-specific supplier declaration, batch traceability, and transaction certificate or equivalent chain-of-custody record where required.
Physical performance: ISO 13934-1 tensile minimum average 350N warp / 250N weft, no individual below 300N / 220N. ISO 13937-1 tear minimum average 18N warp / 15N weft, no individual below 15N / 12N. ISO 6330 dimensional change after 1 agreed cycle max 5% length and width for hemmed style, 6% if fringed. ISO 12945-2 pilling minimum grade 3 after 2,000 rubs. Odour max grade 3/5 on opening. 0 tolerance for sharp contamination, oil stain, mildew or metal fragment.
Inspection: workmanship to AQL 2.5; dimensions and appearance on individual units; GSM on 3 blankets per lot minimum; fibre analysis on 1 composite sample from at least 3 blankets; lot fails on critical contamination, AQL rejection, GSM lot-average failure or composition below tolerance. EXW responsibilities: supplier to provide invoice, packing list, release note, lot trace pack and agreed export support documents before pickup; supplier / buyer loading responsibility to be stated explicitly; risk transfer at named EXW point before loading / or after loading only if agreed in writing.
Failure modes buyers see most often on recycled wool emergency stock
The recurring commercial failures are specific and preventable. Bale-to-bale shade drift happens when reclaimed fibre feed changes mid-run. Control it by sealing an approved finished blanket standard and sampling from each production batch, not just from the first loom or first bale. Metal contamination comes from reclaimed feed and damaged opening lines. Control it through upstream sorting discipline, magnets or detection where available, and 0-tolerance final inspection.
Foreign fibre streaks show up as off-colour bands or synthetic flashes in the melange. Control them by writing a visual threshold under D65 lighting and checking multiple blankets across multiple bales. Odour after humid storage is common where blankets are compressed before they are fully dry or stored in damp areas. Control it with dry-pack dispatch rules, liners, and odour grading at opening. Loose lint and dusty fold lines usually come from weak reclaimed yarn cohesion and aggressive raising. Control them with pilling and fallout checks, plus a realistic acceptance floor rather than vague wording.
Weight drift often traces back to mixed edge constructions or unconditioned weighing. Control it by keeping 600gsm defined as body GSM, excluding fringe, then declaring piece-weight tolerance separately. Short size often appears after heavy brushing and finishing relaxation; that is why the finished-size tolerance must be measured after conditioning, not only at loom state.
Emergency buyers should avoid retail wording such as 'luxury soft', 'super warm', 'premium eco blanket' in the technical schedule unless those claims are backed by a defined test basis or approved marketing brief. Relief procurement works better with measurable construction, durability, packing and handover terms. If you need adjacent references, compare sourcing logic with recycled wool-blend fire and camp blanket sourcing and low-MOQ blanket sourcing trade-offs, but the core controls for this EXW article should already sit in the PO itself.
Frequently asked
Does 600gsm mean each blanket weighs exactly 1.8kg? No. In this article, 600gsm refers to usable finished blanket body mass per square metre, excluding fringe. At 150 x 200cm, theoretical body weight is 1.80kg, but finished article weight moves with hem depth, fringe, labels and moisture regain. Put body GSM and finished piece weight in separate PO lines.
Is ISO 11092 mandatory for emergency blanket buying? No. It is an optional guarded-hotplate route if you need a reported thermal-resistance value on the blanket material. Many relief buyers do not use it and instead buy on size, body GSM, wool percentage and durability criteria. If you do request ISO 11092, state specimen setup clearly so the lab report is interpretable.
How should fibre composition be verified on recycled wool blends? Use the applicable part of the ISO 1833 series selected by the laboratory for the declared wool/synthetic combination, with supporting microscopic identification where needed. Recycled blends can be analytically noisy, so write a dispute tolerance such as measured wool content not more than 3 percentage points below the contractual minimum.
What proof is reasonable for recycled-content claims? Ask for lot-specific evidence: supplier declaration, incoming raw-material traceability, internal batch records, shipment lot mapping and, where contractually required, a transaction certificate or equivalent third-party chain-of-custody document that matches quantity and shipment date. Generic marketing statements are not enough.
What are practical inspection quantities for one lot? A workable minimum for one homogeneous lot is 10 blankets for dimensions and workmanship, 3 blankets for GSM cuts, 3 blankets for tensile and tear specimen cutting, and 1 composite fibre-analysis sample made from at least 3 blankets. Sample cartons or bales from different positions in the lot, not only from the outside layer.
What should be written into EXW terms for blanket pickup? Define pickup readiness, packing list format, document pack, loading responsibility, pallet or bale standard, and risk-transfer timing. At minimum, ask for invoice, packing list, factory release note, lot traceability records and any agreed origin or recycled-claim support documents before the truck arrives.
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