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What Is AQL 2.5 and How Does Sampling Work for Linen Orders?
Direct Answer
What Is AQL 2.5 and How Does Sampling Work for Linen Orders?
AQL 2.5 means an Acceptable Quality Limit of 2.5 defective pieces per 100 units for major defects, applied through a statistical sampling plan (ISO 2859-1 / ANSI Z1.4, normally General Inspection Level II). For a linen clothing order, it works like this: instead of checking every garment, the inspector counts the lot, reads the sample size from the table, draws that many pieces at random, and passes the lot only if the defects found stay at or below the acceptance number. At Linenwind, every bulk order is checked this way before shipment, and the AQL 2.5 inspection result is the gate before the balance payment is released.
Three Things AQL 2.5 Actually Means
2.5 = Major Defect Limit
The 2.5 is the maximum tolerable percentage of defective units in the lot for major defects, measured as a long-run average. It does not say the factory may ship 2.5% bad garments; it defines the statistical risk both sides accept.
Sampling, Not 100% Checking
A random sample is drawn from the whole lot. A 400-piece color lot is normally checked with 50 pieces at Level II; the verdict on those 50 stands for the lot.
Accept / Reject Numbers
Each sample size has two numbers: accept (e.g. 3) and reject (e.g. 4). At or below accept = pass; reaching reject = the lot fails and must be re-screened.
Defect classes matter. AQL 2.5 normally applies to major defects (shade difference, open seams, wrong measurements, stains). Critical defects such as broken needles or wrong fiber-content labels are usually zero tolerance, and minor cosmetic issues are often judged at a looser level like AQL 4.0 if agreed in writing. The full buyer-side explanation is in our guide Linen Garment Quality Inspection: AQL Sampling and What Buyers Should Check.
How Sampling Works on a Real Linen Order
1
Define the lot. One style and one color in one delivery is normally one lot. A 600-piece order in three colors is usually three lots of 200 each, each sampled separately.
2
Read the code letter. The lot size maps to a code letter at the agreed inspection level. General Inspection Level II is the apparel default and the level Linenwind uses unless a buyer specifies otherwise.
3
Draw the sample. The inspector pulls the required number of pieces randomly across the whole lot, mixing cartons and including middle and bottom layers, not just the top pieces presented first.
4
Judge each defect class. Critical, major and minor defects are counted separately. The lot passes a class when the count is at or below its acceptance number, and fails when it reaches the rejection number.
Why Linen Orders Need an AQL Gate More Than Most Fabrics
Linen tests an AQL plan harder than cotton or synthetics, because the fabric carries natural variation that a generic inspector may not know how to judge. Slubs and neps are part of the yarn's character, so they must be defined as acceptable at sampling rather than counted as defects on the day. Shade varies between dye lots, which is why the inspection compares pieces against an approved lab dip or physical swatch instead of against an idea of "the right color". And because linen's normal first-wash shrinkage runs 3-7%, the measurement check only makes sense in a defined state — a garment measured straight off the line will not match the same garment measured after its wash cycle. An AQL clause that names the defect definitions, the shade standard and the measurement state turns these natural properties from arguments into checklist items, which is exactly why our buyer's AQL inspection guide recommends writing them into the order before cutting starts.
Simplified AQL 2.5 Sampling Table for Linen Orders
| Lot Size (pieces) | Code Letter (Level II) | Sample Size | AQL 2.5 Major: Accept / Reject |
|---|---|---|---|
| 51 – 90 | E | 13 | 0 / 1 |
| 91 – 150 | F | 20 | 1 / 2 |
| 151 – 280 | G | 32 | 2 / 3 |
| 281 – 500 | H | 50 | 3 / 4 |
| 501 – 1,200 | J | 80 | 5 / 6 |
Table: simplified single-sampling extract for AQL 2.5 at General Inspection Level II, based on the ISO 2859-1 / ANSI Z1.4 structure. Example: for a 400-piece color lot, the inspector checks 50 garments; 3 major defects pass, 4 fail.
Pass, Conditional and Reject: How the Verdict Is Decided
Approved — defects found are within the acceptance numbers; the lot can ship. Conditional — minor observations only, buyer decides whether corrections are needed before shipment. Rejected — a defect class reached its rejection number; the factory re-screens or reworks, then a second inspection is arranged, normally at the factory's cost.
When a lot is rejected, the sequence that follows is predictable, and it should be written into the order terms so both sides know the path before it happens:
- Re-screen or rework. The factory sorts the lot to remove the defects found, or repairs them where the defect allows it.
- Second inspection. A new AQL sample is drawn from the corrected lot, normally at the factory's cost when the first failure was genuine.
- Disposition in writing. If the lot cannot be brought to standard in time, buyer and factory agree on partial shipment, replacement production or other remedies in writing.
The same discipline protects reorders: when a buyer returns for the same style, the same AQL standard applies, so batch-to-batch comparison is fair rather than a fresh argument about what acceptable means — the point our reorder quality FAQ explains in more detail.
Count defects by class, not as one total
Compare measurements against the approved size spec
Judge shade against the approved standard under daylight (D65)
Measure in the agreed state: post-wash, given linen's 3-7% first-wash shrinkage
Accept natural linen slubs that were agreed at sampling
Record photo evidence for every defect found
Which AQL Level Should a Buyer Choose?
Critical
Zero tolerance: safety and legal issues (broken needles, wrong fiber labels)
Zero tolerance: safety and legal issues (broken needles, wrong fiber labels)
AQL 2.5 major
The apparel default for branded programs; used on all Linenwind bulk orders
The apparel default for branded programs; used on all Linenwind bulk orders
AQL 4.0 minor
Cosmetic issues such as loose threads and light creases, if agreed
Cosmetic issues such as loose threads and light creases, if agreed
AQL 1.0 / 0.65
Stricter plans with larger samples; use when the brand demands it
Stricter plans with larger samples; use when the brand demands it
Choosing a level is only half the decision — the other half is whether the factory's fabric and workmanship standards can support it. A strict AQL number means little if fabric defects are not controlled before cutting, which is why our fabric quality FAQ explains the incoming-fabric checks that give the final AQL verdict something solid to measure.
Common misconception: AQL 2.5 does not mean "2.5% defective garments are allowed to ship." It means the sampling plan statistically controls lots at or below a 2.5% major-defect rate. And no AQL plan replaces the inspection itself: a linen order still needs the two checkpoints described in our production quality inspection FAQ — mid-production checks during sewing and the final AQL check before packing.
Related Questions
- Who performs the AQL inspection? The factory's QC team, the buyer, or an independent agency such as SGS, Bureau Veritas or Intertek — whichever the order documents name. Linenwind shares the final inspection report with the buyer before shipment.
- What if my order fails? The lot is re-screened or reworked and a second inspection follows; genuine failures normally put the re-inspection cost on the factory. See how we handle issues in the quality issue handling FAQ.
- How is linen different at inspection? Natural slub and shade variation must be defined at sampling, and shrinkage means measurements are judged post-wash against the 3-7% first-wash window — both covered in the linen shrinkage control guide.
- Can I add AQL terms to my order? Yes — Linenwind includes the AQL 2.5 quality appendix with the PI, and buyers may request stricter levels, named agencies or special defect lists before production. Start with a free inquiry or read the apparel quality control guide first.
Planning a custom linen order and want the inspection terms clear before you commit? Send us your style idea and target quantity.
Send an Inquiry Contact LinenwindSource: LINENWIND quality control practice, Dongguan, China (ISO 9001 / OEKO-TEX Standard 100 / SEDEX). AQL sampling structure per ISO 2859-1 / ANSI Z1.4, General Inspection Level II. See also: AQL sampling guide for buyers · shrinkage & quality control · bulk lead time.
