Specify the professional-care route before quoting
A 380gsm acrylic-polyester hotel throw cannot be quoted safely from fabric weight alone. The RFQ should define fibre split, yarn type, construction, finished size, edge finish, surface finish, label system, intended professional-care route, test cycle count and pass/fail limits. Without this, the mill may quote a soft brushed sample that looks good before care but relaxes, ripples or glazes after cleaning.
A workable base specification is: acrylic/polyester throw, declared blend such as 60/40, 70/30 or buyer-approved equivalent; finished mass 360–400gsm; size 130 x 170cm or 140 x 180cm; finished size tolerance before care ±2%; finished GSM tolerance ±5%; woven, knit or jacquard construction named; overlocked, blanket-stitched or hemmed edge; retained master sample sealed before testing; one named ISO 3175 route selected before salesman sample approval.
Acrylic gives wool-like bulk and warm handle, but acrylic-rich yarns can relax under solvent exposure, tumble action and finishing heat. Polyester improves tensile stability, yet raised polyester surfaces can flatten or show local shine if heat setting, brushing, shearing or softener selection is not controlled. Loose spun yarns, low twist, aggressive brushing and uneven shearing increase pile matting risk. Resin binders and silicone softeners can also change handfeel after solvent cleaning.
Use commercial RFQ wording like this: “380gsm ±5% acrylic/polyester throw, declared blend, finished size 130 x 170cm ±2%, professional-care test required to named ISO 3175 part and procedure. Primary acceptance route: ISO 3175-3 hydrocarbon professional dry-cleaning, one cycle, full-size throw. Dimensional change after one cycle max ±3% length and width; skew/bow max 2%; edge waviness max 15mm peak-to-valley over any 50cm edge section; appearance and label legibility grade minimum 4 against approved counter sample.”
ISO 3175 is a test-method family. It does not, by itself, grant a care-label claim. ISO 3758 controls the care symbols used on the retail label. The buyer must decide which care symbol is intended, then test the product by the corresponding professional-care route before releasing artwork and bulk labels.
Separate ISO 3175 testing from ISO 3758 care symbols
ISO 3175 reports how the article performs after a specified professional-care process. ISO 3758 tells the consumer or professional cleaner which care symbols may be used. Do not treat a single dry-cleaning report as blanket approval for every professional-care symbol.
For ISO 3758 care-label logic, perchloroethylene dry-cleaning supports the circle with “P” symbol route. Hydrocarbon dry-cleaning supports the circle with “F” symbol route. Professional wet cleaning supports the circle with “W” symbol route. Mild or very mild treatment is shown in ISO 3758 by one or two bars under the relevant symbol, depending on the allowed severity. A hydrocarbon test does not support a “P” claim; a perchloroethylene test does not support an “F” claim; wet-cleaning performance does not replace dry-cleaning performance.
For acrylic-polyester throws, many hotel retail buyers prefer a conservative label such as professional dry-clean, mild process, if the tested route supports it. If the product passes only hydrocarbon but fails perchloroethylene, do not print a “P” symbol. If the throw passes perchloroethylene but has severe pile glazing under hydrocarbon, the buyer can still choose a “P” route, but should not imply universal dry-clean compatibility.
A clear care-label approval gate is: test the full-size throw, sewn labels and trims through the same ISO 3175 route that supports the intended ISO 3758 symbol; review dimensional change, appearance, label legibility and barcode readability; release bulk care-label artwork only after the lab report and retained cleaned sample are approved. For care-symbol alignment, keep the sourcing file linked to ISO 3758 care labeling for acrylic jacquard blankets rather than relying on supplier shorthand.
Use exact ISO 3175 wording in the lab request
The lab request must name the ISO part, edition, solvent route, procedure, cycle count, finishing method and report outputs. Avoid phrases such as “dry-clean test”, “sensitive clean” or “mild dry clean” without the standard part and symbol route. Those terms are used differently by buyers, dry cleaners and labs.
For perchloroethylene, use wording such as: “Test one full-size throw to ISO 3175-2, professional dry-cleaning and finishing using tetrachloroethene/perchloroethylene, procedure corresponding to the intended ISO 3758 P mild symbol. State the ISO 3175-2 edition, procedure number, procedure title, solvent, bath or cage condition, mechanical-action level, drying condition, finishing method and number of cycles on the report.”
For hydrocarbon, use wording such as: “Test one full-size throw to ISO 3175-3, professional dry-cleaning and finishing using hydrocarbon solvent, procedure corresponding to the intended ISO 3758 F mild symbol. State the ISO 3175-3 edition, procedure number, procedure title, solvent, mechanical-action level, drying condition, finishing method and number of cycles on the report.”
For wet cleaning, use wording such as: “Test one full-size throw to ISO 3175-4, professional wet cleaning and finishing, procedure corresponding to the intended ISO 3758 W mild symbol. State wash action, temperature, drying, finishing and cycle count.” Wet cleaning is not a dry-cleaning substitute. It should be tested only if the care label will allow professional wet cleaning or if the buyer wants a separate risk screen.
Procedure numbering and titles can differ between ISO editions, lab scopes and national adoptions. The buyer should not write “Procedure 2 if mild” into the PO. The safer RFQ rule is: the buyer states the intended ISO 3758 symbol severity, the lab maps that to the current accredited ISO 3175 procedure, and the lab report reproduces the exact procedure number, procedure title and controlled parameters. If the buyer requires a fixed edition such as ISO 3175-2:2017 or ISO 3175-3:2017, say so before quotation because some labs quote only the edition in their accredited scope.
Build approval samples around stability, not only colour
Treat the first development sample as a dimensional-stability trial. Mark length and width before cleaning, run the selected ISO 3175 route, condition the throw, then calculate dimensional change. Marking practice is commonly aligned with ISO 3759 and dimensional-change calculation with ISO 5077. The report should list length change, width change, skew or bow, edge waviness, corner twist, pile change, handfeel change, label condition and shade movement.
For hotel retail throws, ±3% length and width after one professional-care cycle is a practical commercial approval limit. It is not an ISO pass/fail value. It is a buyer-grade requirement that keeps a 130 x 170cm throw within about 126.1–133.9cm by 164.9–175.1cm after one cycle, before considering sewing distortion. A three-cycle screen at cumulative ±5% is useful for buyers who expect repeat professional care, but it should be costed and written separately.
Skew and bow need their own limit because a throw can pass shrinkage percentage and still look twisted. Lay the throw flat without stretching, align one long edge to a straight rule, measure maximum offset or diagonal difference, and report both millimetres and percentage. A practical limit is max 2% of the relevant dimension; on a 170cm length, that is about 34mm. For edge waviness, 15mm peak-to-valley over any 50cm edge section is a workable retail limit for 130 x 170cm and 140 x 180cm throws. Tighter limits require firmer setting, more stable yarn and slower sewing.
Suggested approval quantity per colour and construction: three full-size throws minimum — one retained uncleaned master, one tested through the primary ISO 3175 route, and one held for comparison or retest. If both hydrocarbon and perchloroethylene routes are tested, plan four to five full-size throws per colour. Swatches can screen shade and handfeel, but they do not reproduce full-width relaxation, edge ripple, corner twist or label distortion.
Full-size ISO 3175 testing is destructive for approval. The cleaned throw should not be shipped as saleable stock. RFQs should ask the mill to quote sample-making time, lab testing fee, courier cost, expected lab lead time and approval-gate timing. In normal sourcing, allow roughly 3–7 working days to make full-size samples after yarn or fabric is ready, plus the lab’s queue and reporting time. If the buyer changes the care route after sample approval, the timeline and cost reset.
Inspection table for RFQ and bulk control
The table below is a practical control plan for 130 x 170cm or 140 x 180cm acrylic-polyester hotel retail throws. It separates ISO test outputs from buyer acceptance limits. Tighten or loosen the limits only after reviewing construction, price level and intended retail positioning.
| Property | Method | Sample size | Acceptance limit | Defect classification | Retest rule |
|---|---|---|---|---|---|
| Finished dimensions before care | Conditioned flat measurement, no stretching; same table method for all colours | Approval: all submitted samples. Bulk: inspected units under AQL plan | PO size ±2% unless buyer specifies tighter | Major if outside tolerance; critical only if wrong labelled size creates legal or channel issue | If one approval sample fails, remake or remeasure after conditioning once; if still failed, correct cutting/setting before retest |
| Finished GSM | ISO 3801 or agreed mass-per-area method on fabric before cut; finished article mass cross-check | Approval: one fabric cut per colour. Bulk: at least one roll or panel per dye lot | Nominal 380gsm ±5% unless construction requires different tolerance | Major if outside tolerance and handfeel/weight claim affected | Retest one reserve specimen from same roll; if confirmed, segregate lot and re-approve weight |
| Dimensional change after professional care | ISO 3759 marking and ISO 5077 calculation after named ISO 3175 route | Approval: one full-size throw per colour per route minimum. Bulk: one full-size throw per bulk colourway or per 5,000 units, whichever gives wider coverage | One cycle max ±3% length and width; three-cycle screen target max ±5% cumulative if specified | Major for buyer-limit failure; critical if care label claim becomes unsupported | Retest from retained duplicate only if lab error, handling error or borderline result within 0.5 percentage point is suspected; confirmed failure requires corrective sample |
| Skew or bow | Flat table, maximum offset or diagonal difference recorded in mm and % | Same cleaned full-size samples plus retained master for comparison | Max 2% of relevant dimension; no visible twist when folded | Major | Retest one duplicate only if folding or table layout is disputed; confirmed failure requires construction or setting correction |
| Edge waviness and corner twist | Measure peak-to-valley over any 50cm edge section; photograph worst area | All cleaned approval samples; bulk visual check under AQL | Max 15mm peak-to-valley; no corner twist that prevents retail folding | Major; minor if slight and not visible in retail fold | Retest duplicate only after steam recovery is defined in the method; do not steam one sample and compare with an unsteamed standard |
| Appearance and pile retention | Visual grading 1–5 against retained master under D65 or TL84; optional pile-height reading | Cleaned sample plus uncleaned master for each colourway | Minimum grade 4 after one cycle; pile-height loss target max 10–15% if measured | Major if matted, glazed, bald or harsh; minor for slight acceptable nap direction change | Panel review with buyer photos if grade is 3–4; confirmed grade below 4 requires finish correction |
| Shade change | Grey scale assessment, commonly ISO 105-A02 where requested | Each tested colourway, including darkest shade and any red/navy/melange | Grade 4 minimum for solid retail colours; grade 3–4 only by written concession | Major if shade family changes; critical if claim or set matching fails | Retest only if staining, lab contamination or wrong master is suspected; otherwise review dyeing and finishing |
| Crocking risk after care | ISO 105-X12 or AATCC 8 if buyer market requires; dry and wet rubbing | Darkest bulk colour and printed/contrast areas | Typical target dry 4, wet 3–4 or buyer manual requirement | Major for retail throws; critical if safety or staining claim applies | Retest duplicate if result conflicts with approved lab dip; confirmed failure requires shade or fixation correction |
| Care label durability | Same ISO 3175 route as throw; visual legibility grade 1–5; barcode scan if present | Every tested full-size throw with production-intent label attached | Legibility grade minimum 4; label shrinkage max 3%; barcode/QR readable if specified | Critical if fibre content, care instructions or regulatory information unreadable; major for brand label damage | Retest with same label lot only if attachment error is suspected; confirmed failure requires label substrate/ink/attachment change |
| Seam and edge strength after care | Visual seam check plus buyer-agreed seam pull or ASTM D5034-style strip reference where applicable | Cleaned sample and bulk AQL visual inspection | No open seam, skipped overlock, broken blanket stitch or seam slippage visible after care | Major; critical if sharp trim or detached small part applies | Retest duplicate after confirming needle/thread specification; confirmed failure requires sewing parameter correction |
| Packaging fit after care sample review | Fold cleaned sample to approved retail pack size; check belly band, insert or zipper bag fit | One cleaned sample per pack format | Cleaned and uncleaned throws must fold without edge flare or forced compression | Minor to major depending on retail presentation | No lab retest needed; adjust pack size only after buyer approves dimensional risk |
For bulk AQL, use a written sampling plan rather than informal carton checks. A common retail setting is AQL 0 for critical defects, AQL 2.5 for major defects and AQL 4.0 for minor defects, with general inspection level II unless the buyer’s manual states otherwise. Care-label illegibility, wrong fibre content, unsupported care symbol and severe seam failure should be treated as critical or major depending on market risk. For more inspection structure, align the PO with blanket quality control inspection requirements.
Define lot coverage and retest economics
Define the production lot before testing. For this product, a practical lot is one PO, one construction, one care-label version and one bulk colourway produced under the same finishing recipe. If the same design uses different yarn lots, dye lots or finishing dates, record them as sub-lots. Do not let one beige test report cover a navy colourway with heavier dye load and different softener behaviour.
Lab dips and bulk are different controls. Lab dips verify shade and basic fastness before bulk dyeing. Bulk ISO 3175 testing verifies the finished article after production-intent knitting or weaving, brushing, shearing, sewing, label attachment and packing trial. For a new programme, test every colourway at approval. For repeat orders with unchanged yarn, construction, finish and label, buyers may reduce testing to the darkest colour, the most unstable construction and one rotating colourway per shipment, but only after the first deliveries are stable.
A workable bulk-testing frequency is: one full-size ISO 3175 test per colourway for first production; then one full-size test per 5,000–10,000 units or per dye lot for repeat programmes, plus any colourway with new yarn, new softener, new label substrate, new edge stitch or changed care symbol. For small boutique orders below 1,000 units, buyers often test one worst-case colour and rely on retained masters for the rest, but this is a risk decision, not a standards requirement.
State who pays for retesting. If the sample fails because the mill changed yarn, finish, size setting, label or sewing from the approved specification, the mill should normally pay for the corrective retest. If the buyer changes the care route, lowers tolerance, requests an extra cycle count or changes label artwork after approval, the buyer should expect to pay the added test fee and sample cost. If the lab reports a handling error, contamination or wrong procedure, the retest cost should follow the lab’s dispute policy.
A retest should not be used to shop for a passing result. The PO should allow one retest from a retained duplicate only when the first result is borderline, the method is disputed or there is documented lab handling error. If the duplicate also fails, freeze shipment, segregate affected lots and require corrective action before any concession. For shipment calendar planning, connect the test gate to custom blanket lead times and shipping so the approval date is not hidden inside production time.
Correct the process according to the failure mode
Shrinkage beyond ±3% usually points to insufficient relaxation before cutting, inadequate heat setting, unstable yarn construction, excessive finishing tension release or a fabric structure that was developed too open for the desired handfeel. Corrective action can include pre-relaxing greige fabric, adjusting stenter or heat-setting conditions, reducing finishing stretch, changing yarn twist or count, and approving a slightly firmer handfeel. Do not solve shrinkage only by cutting oversize unless the post-care shape remains square and the pre-care retail size is still acceptable.
Skew, bow and corner twist usually come from fabric torque, uneven tentering, off-grain cutting, asymmetrical border tension or sewing feed imbalance. Corrective action includes rebalancing fabric feed, relaxing rolls before cutting, checking marker alignment, controlling differential feed on overlock machines and changing edge thread tension. For jacquard or yarn-dyed constructions, repeat and border placement also need review.
Pile matting, harshness and glazing can come from low yarn twist, weak acrylic staple cohesion, too much brushing, uneven shearing, high finishing heat, incompatible softener or excessive mechanical action during cleaning. Corrective action includes reducing brush depth, adding a stabilising shear pass, changing softener chemistry, increasing pile density or choosing a less aggressive raised surface. A very lofty salesman sample may need to be moderated to pass professional-care testing.
Label damage has separate causes. Polyester satin, nylon taffeta, printed cotton tape and recycled polyester labels behave differently under solvent and finishing heat. Specify label substrate, label size, print method, ink system, attachment thread and stitch type. Test the label sewn into the throw, not loose. Grade legibility from 1 to 5, where 5 means no visible change, 4 means fully readable with slight change, 3 means readable but commercially weak, 2 means partly unreadable, and 1 means unreadable. The care label must be assessed after the same ISO 3175 route as the throw.
Edge ripple after cleaning often comes from a mismatch between body fabric relaxation and edge stitch tension. Overlocked edges can tighten; blanket stitching can draw in corners; hemmed edges can trap differential shrinkage between folded layers. Corrective action includes lowering thread tension, changing stitch density, using compatible sewing thread shrinkage, pre-relaxing the body before edge sewing, or switching to a more forgiving edge finish. If the buyer demands a very soft brushed body and a flat decorative border, test both together before price confirmation.
RFQ checklist for sourcing teams
Use this checklist before releasing a PO: fibre blend and tolerance stated; construction and yarn system named; finished size and GSM tolerance stated; edge finish and stitch density agreed; surface finish approved by retained master; intended ISO 3758 symbol selected; ISO 3175 part and route named; lab edition and procedure mapping confirmed by accredited lab; one-cycle and any three-cycle limits written; label substrate, print method and attachment method specified; destructive sample ownership agreed; test cost and lead time quoted; bulk AQL and retest rules written.
Do not approve bulk care labels before professional-care testing. Do not let a swatch test replace a full-size throw test for first production. Do not use a hydrocarbon pass to justify a perchloroethylene symbol. Do not treat ±3% shrinkage, ±5% three-cycle screening, 2% skew or 15mm edge waviness as ISO pass/fail values; they are buyer specifications that must be written into the contract.
For a balanced hotel retail programme, FIELDLOOM would normally set the first approval around one full-size throw per colour per intended care route, a retained uncleaned master, one reserve duplicate, AQL 0/2.5/4.0 inspection, and shipment release only after lab report, cleaned sample photos and label review are approved. That structure costs more than a swatch-only approval, but it prevents the common failure where a soft counter sample sells the programme and the first cleaned throw no longer looks like the product the hotel buyer approved.
Frequently asked
Is ISO 3175 a pass/fail standard for acrylic-polyester throws? ISO 3175 defines professional-care test methods. It does not set universal pass/fail limits for shrinkage, skew, appearance or labels. The buyer must write commercial limits such as ±3% one-cycle shrinkage, max 2% skew and minimum appearance grade 4 into the RFQ or PO.
Which ISO 3175 route supports a dry-clean care label? Perchloroethylene testing under ISO 3175-2 supports the ISO 3758 P route. Hydrocarbon testing under ISO 3175-3 supports the ISO 3758 F route. Professional wet cleaning under ISO 3175-4 supports the ISO 3758 W route. Mild or very mild symbol severity must match the procedure used by the lab.
Can we test only a fabric swatch instead of a full throw? Swatches are useful for early screening, but first production approval should use a full-size throw with production-intent edge sewing and labels. Swatches do not show full-width relaxation, edge ripple, corner twist, retail folding behaviour or sewn-label distortion.
What sample quantity should we budget for first approval? Plan at least three full-size throws per colour and construction: one retained uncleaned master, one tested through the primary ISO 3175 route and one reserve duplicate. If both hydrocarbon and perchloroethylene routes are required, plan four to five full-size throws per colour.
Who should pay for retesting after failure? If the mill changed yarn, finishing, sewing, label substrate or construction from the approved specification, the mill should normally pay for corrective retesting. If the buyer changes the care route, adds extra cycles or tightens limits after approval, the buyer should expect to pay the added testing and sample cost.
What are the most common dry-cleaning failures on acrylic-polyester throws? The common failures are length or width relaxation, skew, rippled edges, corner twist, pile matting, glazing, harsh handfeel, shade change and damaged care labels. Each points to a different correction, so the inspection report should record measurements, photos and the exact ISO 3175 route used.
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