If you have bought knitted fabric for a few years, you have met at least two of these. The useful question is not what went wrong but which test would have caught it before the container left.
Why failures cluster around one or two parameters
In knitted fabric, the parameters in the table below are not independent. Weight and Stitch length between them explain most field failures, and both are routinely omitted from quotations because they are expensive to guarantee and easy to leave vague.
| Parameter | Typical range | Why it decides failure |
|---|---|---|
| Weight | 120-320 gsm | Apparel hand and opacity. Tolerance of +/- 5 % is normal, +/- 10 % is a claim waiting to happen. |
| Stitch length | 2.6-3.4 mm | Looser stitch is softer and pills faster; tighter is firmer and heavier. |
| Courses and wales | 18-32 cpi / 14-24 wpi | Density check that catches a lightweight fabric sold as heavy. |
| Width | open 160-180 cm / tubular 60-90 cm | Tubular costs less per kg and more per cut panel. |
1. Skew / torque
What you see. Side seams spiral after washing, garments twist on the body.
Why it happens. High twist yarn, poor relaxation, or tubular fabric slit without rest.
How to catch it before you order. AATCC 179 skew after home laundering, measure before and after.
What to specify instead. Specify <= 5 % skew, require relaxation before cutting, and buy open width for critical styles.
2. Shrinkage beyond claim
What you see. Garment drops a size in the first wash.
Why it happens. Insufficient compaction, or a compactor setting changed between lots.
How to catch it before you order. ISO 6330 domestic wash at 40 C, then ISO 5077 dimensional change, 3 cycles.
What to specify instead. Specify 3-cycle figures, not 1-cycle, and hold the compactor setting as a controlled parameter.
3. Barre (fabric bars)
What you see. Horizontal bands appear after dyeing, worst on dark shades.
Why it happens. Yarn count variation or uneven tension across the beam.
How to catch it before you order. Visual inspection on a light box after dyeing; count bands per 10 m.
What to specify instead. Yarn lot control and tension monitoring; reject at greige if bands are visible before dyeing.
4. Pilling
What you see. Surface balls up under abrasion, especially at cuffs and under bag straps.
Why it happens. Short staple, loose stitch, or a brushed finish without anti-pill treatment.
How to catch it before you order. ISO 12945-2, 2000 and 7000 rubs.
What to specify instead. Longer staple cotton, tighter stitch, or an enzymatic anti-pill finish.
Building a test plan you will actually run
| Test | Method | Acceptance |
|---|---|---|
| Dimensional change | ISO 6330 + ISO 5077 | <= 5 % after 3 washes |
| Skew | AATCC 179 | <= 5 % |
| Pilling | ISO 12945-2 | >= grade 3-4 at 2000 rubs |
| Colour fastness to washing | ISO 105-C06 | >= grade 4 change, >= 3-4 staining |
| Bursting strength | ISO 13938-1 | report value |
Five tests is enough for a first order. The point is not comprehensiveness, it is that the same five run on every lot, so a change becomes visible. A test nobody repeats is a story, not a control.
Run them on production material, not on a development sample. Ask for the report to carry the lot number and the date, and keep it with the shipment file. When a claim arrives two years later, that file is the difference between a discussion and a write-off.
What the report should contain
- The method, by standard number, not by description.
- The measured value, not only pass or fail. A marginal pass tells you where the risk sits.
- The sampling position: which roll, which metre, which batch.
- The conditioning before testing, because humidity changes several of these results.
- The laboratory name and the date, so the report can be traced.
Specification ranges for knitted fabric are on the product page. If a failure you are seeing is not covered here, send the batch details and photographs — we will tell you what we think caused it, including when the cause is upstream of the material.
Questions buyers ask before ordering
Can you match a Pantone colour on cotton jersey?
Within dE <= 1.0 on most shades. Very bright greens and some blues are outside the reactive gamut; we will tell you before sampling rather than after.
Do you offer compacted fabric?
Yes, and we recommend it for any garment that will be washed by the end consumer. Compaction adds cost and removes most shrinkage claims.
What is your minimum for a custom colour?
500-800 kg depending on shade depth. Stock white and black can go lower.
Seven lines that turn a quotation into a specification
Most post-delivery arguments are not about quality. They are about a document that never said which figure would be measured, on which instrument, at whose cost.
- Width (open 160-180 cm / tubular 60-90 cm): state where in the band this order sits. The middle of the band is not what a tolerance is for.
- Shrinkage: the figure you will accept inside the <= 5 % length, <= 4 % width band, the tolerance on it, and the method used to measure it.
- Skew (torque) (<= 5 %): name the number, not the word. If the answer only repeats the band, ask which point inside it is being offered for this order.
- Structure: jersey / interlock / rib / fleece is the market band. Fix the figure you will test at goods-in, and the instrument you will test it with.
- Deviation rule: anything outside the agreed bands is reported before shipment, not after arrival.
- Packing and marking: shipping mark, roll or carton count and the tolerance on quantity, since a short shipment is a claim too.
- Who inspects: third-party, in-house or none, decided in advance, with the AQL level written down.
Three questions, and the answers that separate mills
If the claim you are handling is going to be decided on a call, take these three questions into it.
| Question | Answer that should worry you | Answer that holds up |
|---|---|---|
| Which test catches barre (fabric bars)? | “We have never had a complaint.” | Pilling — on the production lot, with the acceptance figure written into the report and not into the email. |
| May I see a report for a lot you shipped last month? | “That is confidential customer information.” | A redacted report, which carries every number that matters and none of the customer’s identity. |
| Where in the <= 5 % length, <= 4 % width band will this order sit? | “In the middle, normally.” | A stated target and the readings behind it. Shrinkage drifting inside the band is how a conforming lot still fails. |
Dealing with a failure now, or trying to avoid one?
Send the end use, the quantity and the destination market, and we will come back with a specification that meets it, a price at your volume and the test reports that back it up. Samples are free for qualified programmes; we charge the courier only.
Related reading
Sample cut with your values on it · Neutral packing and private label · Consolidation, documents and lead times
