Understanding EN 455‑4:2009 – shelf life
A shelf-life claim is a tested statement. Accelerated ageing supports three years; five years needs real-time data – and the glove must still pass parts 1 and 2 at the end of it.
A shelf-life claim on a glove box is not a marketing figure. Under EN 455-4 it is a tested statement about how long the glove keeps its measured performance, and the standard sets out exactly how it must be established.
It applies to existing, new and significantly modified designs, across latex, nitrile and polyisoprene. Designs without ageing data must have it generated.
What must still be true at the end of shelf life
Ageing is not tested for its own sake. Three properties are re-tested after both accelerated and real-time ageing:
A glove at the end of its stated shelf life must still pass the same requirements it passed when new. That is the whole point of the standard.
The two routes to a shelf-life claim
Accelerated ageing uses kinetic principles – the Arrhenius relationship between temperature and reaction rate – to estimate degradation and assign a provisional shelf life while real-time work is still running. The standard does not prescribe a single oven temperature and time for this: Annex B is informative guidance, and the study must be designed around the degradation mechanism of the material in question. Whatever temperature is chosen, the gloves must come from the same production lots used for the real-time study.
(Do not confuse this with the challenge test in EN 455-2, which is a fixed seven days at 70 °C for force at break. That is a different test in a different part of the standard.)
Real-time stability testing is Annex A, and it is normative. Gloves in their consumer packaging – the peel pack for sterile gloves – are stored at the manufacturer's own stated temperature, 25 °C being the mean kinetic temperature for temperate climates, and assessed at intervals of one year or less across the claimed period. A minimum of three lots is required, and the rule that matters: lots are tested and reported individually and may not be combined. Each lot must pass every requirement for the claim to stand at that interval.
Four things are checked at each interval: median force at break over 13 gloves per EN 455-2, freedom from holes per EN 455-1, that the glove remains fit for its intended purpose, and pack integrity for sterile gloves.
The relationship between the two is the part most often misread:
Stability testing must be completed before a new or significantly modified glove is placed on the market, and any significant product change requires shelf life to be re-determined.
There is also an obligation with teeth attached. If real-time data later shows a shorter life than the accelerated claim, the manufacturer must notify the relevant regulatory authorities and revise the claim to match the real-time result. For gloves already on the market, real-time studies must be completed for the full claimed period. A supplier quoting five years on accelerated data alone is not merely optimistic, they are outside the standard.
Why the date of manufacture matters
Shelf life runs from the date of manufacture, which EN 455-2 defines as the packaging date and requires on the glove or its packaging. Storage conditions then decide whether the glove actually reaches that date in usable condition: our own products are specified for storage in original packaging in a dry, dark place at room temperature, protected from heat, humidity, bright light and ozone. Gloves stored on a sunny loading bay do not perform to their label, whatever the label says.
We cover this in practical terms in the guide to storing nitrile gloves.
Two further requirements sit alongside the testing. The labelling must remain readable at the end of the shelf life (EN 1041), and the manufacturer must supply storage instructions to the end user, either printed on the consumer package or in an accompanying document. For sterile products, EN ISO 11607 governs sterile barrier integrity for the full claimed period.
One caveat for tender language: EN 455-4 dates from 2009 and its Annex ZA maps to the old Medical Devices Directive 93/42/EEC, not to the MDR. It remains the current edition of this part, but the conformity route it describes is the historical one.
What to require in a tender
Our examination and surgical gloves carry a five-year shelf life supported by real-time data, with the ageing results available on request.
Frequently asked questions
What shelf life does EN 455-4 allow? A maximum claim of five years from the date of manufacture. A claim based only on accelerated ageing is limited to three years; going beyond that requires real-time stability data. The standard does not set a minimum.
How long do medical gloves actually last? Under proper storage, nitrile gloves are typically specified at five years and latex at three, reflecting how each material ages. The figure on the box is the one to use – gloves past their stated shelf life should not be used in a clinical setting, regardless of how they look.
Does EN 455-4 cover biological safety? No. Biological evaluation, powder and protein limits are EN 455-3. EN 455-4 covers shelf-life determination only.
Do gloves have an expiry date? Yes. It follows from the shelf life established under this standard and the date of manufacture on the packaging.
Key takeaways
Seventeen years sourcing and supplying medical gloves and PPE to governments, UN agencies, NGOs and healthcare systems. Writes on glove standards, quality management and responsible sourcing for institutional buyers, working from the source standards rather than secondary summaries.
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