AQL, or Acceptable Quality Limit, is the statistical measure used to judge pinhole defects in disposable gloves. For medical examination gloves, most professional buyers specify AQL 1.5: it is the level required by EN 455-1 for the European market and it exceeds the FDA minimum for patient examination gloves in the US. Our KG-1101 nitrile examination gloves are produced at AQL 1.5 across the whole line.
What Does AQL Actually Mean?
AQL stands for Acceptable Quality Limit (often written Acceptable Quality Level). It comes from the sampling standards ISO 2859-1 and ANSI/ASQ Z1.4, which define how many pieces are drawn from a production lot and how many defective pieces are allowed before that lot is rejected.
Two points matter for buyers:
- AQL is a process average, not a per-box guarantee. An AQL 1.5 sampling plan accepts production running at roughly 1.5 defects per 100 gloves as its long-term average. An individual box can still contain a defective glove; what the plan controls is that the overall lot stays within the limit.
- AQL applies to a defined defect class. For examination gloves, the defect that counts is a pinhole that breaks the barrier. Cosmetic marks or minor stains are different defect classes with their own, looser AQL values.
The smaller the AQL number, the tighter the requirement: AQL 1.5 is stricter than 2.5, which is stricter than 4.0.
How Are Pinholes Tested?
The standard method is the water leak test. EN 455-1, the European standard for freedom from holes in medical gloves, and ASTM D5151, its US counterpart, use essentially the same procedure: the glove is filled with 1,000 mL of water, hung by the cuff for two minutes, and examined for any droplet or wet streak on the outside. One visible leak means the glove fails.
Because the test destroys the glove, it is always done on a sample. Under ISO 2859-1 single sampling at General Inspection Level I, a production lot of 35,001 to 150,000 gloves is judged on a random sample of 200 gloves. The acceptance numbers then depend directly on the AQL:
- At AQL 1.5, the lot passes if 7 or fewer gloves leak, and is rejected at 8 or more.
- At AQL 2.5, the same sample passes with up to 10 leakers.
- At AQL 4.0, it passes with up to 14.
This is the practical meaning of the numbers. Moving from AQL 2.5 to AQL 1.5 is not marketing language; it changes the pass/fail line on the inspection table, and it forces the factory to hold its true pinhole rate well below 1.5 percent, otherwise lots start failing.
AQL 1.5 vs 2.5 vs 4.0: Where Each Level Is Used
| AQL level | Indicative defect average | Typical acceptance use |
|---|---|---|
| AQL 4.0 | Up to ~4 leakers per 100 gloves | Industrial, food-service and general-purpose gloves; not accepted as medical gloves in most markets |
| AQL 2.5 | Up to ~2.5 leakers per 100 gloves | US minimum for patient examination gloves (FDA 21 CFR 800.20); ASTM D6319 nitrile exam gloves |
| AQL 1.5 | Up to ~1.5 leakers per 100 gloves | EN 455-1 medical gloves for Europe; FDA level for surgeons’ gloves; standard requirement in most medical tenders |
| AQL 1.0 | Up to ~1 leaker per 100 gloves | Premium or specialty orders; tighter sampling raises inspection cost, so agree the plan with the factory in advance |
Why Do Medical Buyers Usually Ask for AQL 1.5?
The main reason is regulatory coverage. EN 455-1 sets AQL 1.5 as the freedom-from-holes requirement for medical gloves sold in Europe, and the FDA applies the same 1.5 level to surgeons' gloves. A glove line produced at AQL 1.5 can therefore be documented for both markets with one specification, while an AQL 2.5 line only covers the US examination-glove minimum.
The second reason is barrier margin. Cutting the acceptable defect average from 2.5 to 1.5 removes roughly 40 percent of the tolerated pinholes. For distributors supplying hospitals, dental chains or laboratories, that difference shows up directly in complaint and return rates.
The third reason is tender eligibility. Hospital and government tenders commonly write "AQL 1.5 per EN 455-1" into their technical schedules, so importers who buy at that level can bid without re-testing or re-specifying product.
Our own production follows this level. The KG-1101 3.5g, 4.0g and 5.0g nitrile examination gloves, and the heavy-duty KG-1303 6.0g chemo-grade glove, are all produced at AQL 1.5, with every lot tested for freedom from holes before shipment.
What Should You Put in a Purchase Specification?
A purchase spec that only says "medical grade" or "low pinhole rate" is not enforceable. Write the numbers in:
- Defect class and AQL value: "Freedom from holes (pinholes): AQL 1.5".
- Test method: EN 455-1 water leak test or ASTM D5151.
- Sampling plan: ISO 2859-1 or ANSI/ASQ Z1.4, General Inspection Level I, single sampling, normal inspection.
- Product standard: EN 455-1 for the European market, ASTM D6319 for US nitrile examination gloves.
- Lot documentation: a certificate of analysis for each production lot, including the water leak test result.
- Inspection arrangement: who inspects (the factory or a third party such as SGS, TÜV or Intertek), at what stage (pre-shipment is normal), and what happens if a lot fails (sorting, replacement or rejection, and who pays for it).
With those six lines in the purchase order, both sides know exactly how a lot will be judged, and an arriving container can be checked against the same plan.
FAQ
Is AQL 1.5 good for examination gloves?
Yes. AQL 1.5 is the level EN 455-1 requires for medical gloves in Europe and the level the FDA applies to surgeons’ gloves. It is tighter than the AQL 2.5 minimum for US patient examination gloves, and it is the level most hospitals and tenders ask for.
What AQL should I specify for medical gloves?
Specify AQL 1.5 for pinholes, tested per EN 455-1 or ASTM D5151. If you only sell into the US examination-glove market, AQL 2.5 is the regulatory floor, but most importers standardize on 1.5 so the same stock also covers Europe and tender business.
Is AQL the same as the pinhole rate?
No. AQL is a statistical acceptance limit for a production process, judged by sampling each lot. The actual pinhole rate of a well-run line is normally well below the AQL; if the process average sits at the AQL for long, lots start failing inspection.
How can I verify AQL when the goods arrive?
Ask a third-party inspector to sample the shipment per ISO 2859-1 General Inspection Level I and run the water leak test, then compare the number of leakers with the acceptance number in your purchase order. For a quick self-check, fill gloves with 1,000 mL of water, hang them for two minutes and count leaks. Also match the factory’s certificate of analysis lot by lot.
Need nitrile examination gloves produced and documented at AQL 1.5? Contact our export team for datasheets, samples and a quotation, or browse our full nitrile glove range.