You've seen it printed on the side of a glove box — AQL 1.5 or AQL 4.0. Most people ignore it. It's actually one of the most important numbers on the packaging, and understanding it takes less than two minutes.
What AQL stands for
AQL means "Acceptable Quality Level" — the quality level that is the worst tolerable in a production batch. So if a production run is required to have an AQL of 1.5, no more than 1.5% of gloves in that batch can have defects.
For disposable gloves specifically, AQL measures one thing: the percentage of gloves in a batch permitted to have pinholes — tiny holes that compromise barrier protection.
How the test works
It's not practical to test every glove in a batch of 100,000. Instead, a defined number of gloves from each production batch are selected and tested for water-tightness. The gloves are filled with 1,000ml of water and observed for a set time. The test is passed when no water leaks from the glove, proving it has no holes.
The results from that sample are used to predict the quality of the entire batch. This statistical method — originally developed by the US Army to test ammunition quality during the Second World War — is now an internationally recognised quality standard across manufacturing industries worldwide.
What the numbers actually mean
The lower the AQL number, the stricter the standard and the fewer defects are permitted:
AQL 4.0 — Industrial grade
Up to 4% of gloves in a batch may have pinhole defects and the batch still passes. Adequate for most non-clinical business uses: automotive, food handling, cleaning, general industry.
AQL 1.5 — Medical/Exam grade
The stricter standard required for medical examination gloves. European Standard EN455 states that medical examination gloves shall have an AQL score of 1.5 — meaning fewer than 1.5% of gloves in any batch can have defects.
AQL 0.65 — High protection
Used in specialist environments such as microbiology labs, surgery and cleanroom applications. Significantly stricter, higher cost.
The most common AQL numbers in the UK are 1.5 and 4.0 — those are the two you'll see on most commercial glove boxes.
AQL and the industrial vs exam grade distinction
This is the practical part. AQL is the number that separates industrial grade from exam grade — and it matters in certain industries:
Industrial grade (AQL 4.0) — appropriate for: garages and workshops, food preparation, cleaning, general business use. The vast majority of UK businesses ordering nitrile gloves for everyday tasks are absolutely fine with AQL 4.0.
Exam grade (AQL 1.5, EN455 certified) — required for: tattoo studios, piercing studios, any procedure involving contact with blood or bodily fluids, first aid, clinical environments. If your work involves bloodborne pathogen exposure, AQL 4.0 is not sufficient.
One important clarification: a box that says "AQL 1.5" is not automatically exam grade. To confirm a glove is truly exam grade, look for EN455 certification or the word "Examination" or "Exam" on the packaging. The AQL rating is the test result — EN455 certification is what confirms the glove has gone through the full medical device registration process.
Does a higher AQL mean a glove isn't safe?
Not for most uses. AQL specifically measures pinhole defects — it doesn't measure thickness, tensile strength, chemical resistance or overall build quality. A well-made 6 mil industrial glove rated AQL 4.0 may be far more durable and protective for mechanical work than a thin 3 mil exam glove rated AQL 1.5.
The question is whether pinhole integrity specifically matters for your application. For tattooing — where a microscopic hole represents a bloodborne pathogen exposure route — AQL 1.5 matters significantly. For a mechanic changing oil — where the risk is chemical contact rather than pathogen transmission — AQL 4.0 is entirely appropriate.
Quick reference
| AQL | Grade | Typical use |
|---|---|---|
| 4.0 | Industrial | Workshops, food prep, cleaning, general business |
| 1.5 | Medical/Exam | Tattooing, piercing, clinical, first aid |
| 0.65 | High protection | Surgery, microbiology, cleanrooms |
FAQ
What does AQL mean on a glove box?
Acceptable Quality Level — the maximum percentage of gloves in a production batch permitted to have pinhole defects. Lower number = stricter standard = better barrier integrity.
What's the difference between AQL 1.5 and AQL 4.0?
AQL 1.5 is the medical/exam grade standard — required for procedures involving bloodborne pathogen exposure. AQL 4.0 is the industrial standard, appropriate for most general business use.
Do I need AQL 1.5 for my tattoo studio?
Yes. And specifically EN455 certification — look for "Examination" or "Exam" on the box. AQL 1.5 alone without EN455 doesn't confirm full medical device compliance.
Do I need AQL 1.5 for food handling?
No. AQL 4.0 is perfectly adequate for food handling. AQL 1.5 is specifically relevant where pathogen barrier integrity is critical, such as clinical or body art settings.
Why does AQL matter if I'm buying in bulk?
Consistency. A lower AQL means tighter quality control across every batch. For high-volume operations, fewer defective gloves per case means less waste and lower risk of a compromised glove going unnoticed.
How do I know if my gloves are exam grade?
Look for EN455 on the packaging, or the words "Examination" or "Exam". AQL 1.5 alone is not sufficient confirmation — it's the EN455 certification that makes a glove exam grade.
Not sure which AQL is right for your business? Call us on +44 7707 316118 — we'll help you find the right spec.
Related reading: Shop Disposable Gloves | Nitrile Gloves | Glove Thickness Guide