What EU GMP Annex 1 Actually Demands of the Gloves on Your Operators’ Hands

On 22 August 2022, the European Commission published a document that quietly rewrote the rules for anyone who fills a vial, compounds a sterile preparation, or assembles an implant in Europe.

It runs to fifty-odd pages. Most of it concerns air, water, and the movement of people.

But buried in its logic is a demand that reaches all the way down to the thing your operator pulls over their fingers before they touch anything: the glove.

The revised Annex 1 to the EU GMP guidelines came into force in August 2023. It is enforceable across all twenty-seven member states, and through the Pharmaceutical Inspection Co-operation Scheme it now binds regulators in more than fifty countries. And at its heart sits a concept that will now define how you choose and buy gloves: the Contamination Control Strategy.

The CCS is the site’s single, documented plan for keeping three things away from the product: microorganisms, particles, and endotoxin. Annex 1 defines it as a planned set of controls derived from current product and process understanding.

In plainer words, it is the master argument you make to an inspector for why nothing harmful reaches what you make.

Here is the part most glove buyers miss. A glove is not outside that argument. It is inside it. The gloved hand is often the last thing to touch an open vial, a filling needle, a sterile component. If the glove sheds particles, it fails the strategy. If the glove carries endotoxin, it fails the strategy.

Annex 1 explicitly requires that glove materials have appropriate resistance and that glove change frequency be defined within the CCS. The glove is a documented control, and like every control, it has to be justified.

So the question stops being “is this glove sterile?”

Instead, the real question is the one the regulation forces: can you defend, on paper, that this glove does not undermine your control of particles and endotoxin?

Conflating sterility and endotoxin is one of the most expensive mistakes in cleanroom glove selection. After all, sterilisation kills microorganisms but does not remove the endotoxin they leave behind.

Endotoxin is a fragment of the outer membrane of gram-negative bacteria, and it survives the death of the cell that carried it. Worse, irradiation, the very process used to sterilise gloves, can raise the endotoxin load by rupturing any gram-negative bacteria present before the dose is delivered.

A glove can be perfectly sterile and still carry enough endotoxin to matter, because the two properties are controlled at completely different stages of manufacture.

Reach for the European standard and you find a definition. Under EN 455-3, a single-use glove may be labelled “low endotoxin” if it carries no more than 20 endotoxin units per pair. That is the bar. It is the number the whole category clears.

And that is the problem. When every glove on the shortlist clears the same bar, the label stops sorting them for you. It tells you a glove is not disqualified. But you still don’t definitively know if you can trust it with an open vial.

Look closer and a second pattern appears. A sterile cleanroom glove is really being asked to do several jobs at once: resist pinholes, stay clean of particles, hold down endotoxin, protect against chemicals, and still feel like a second skin so the operator can work. Push hard on one and the others tend to give.

A glove optimised purely for a razor-thin pinhole figure may say little about its endotoxin floor. A glove processed for the lowest particle count may not be the one making the boldest cleanliness claim on the membrane itself. The category is full of gloves that lead on one axis and stay quiet on the rest.

The glove worth finding is the one that refuses that trade-off: that holds endotoxin, particle cleanliness, and the allergen question together, in a single pair, without asking your CCS to accept a weak point somewhere else.

The HALYARD* PUREZERO* HG3 Cream Sterile Latex Cleanroom Glove is specified to a maximum endotoxin level of less than 7.5 EU per pair, roughly a third of the 20 EU per pair that the European standard sets as the threshold for a “low endotoxin” claim.

So when an inspector asks how you control endotoxin at the glove interface, “Well, it meets the low-endotoxin standard” is an answer everyone can give.

But being able to say “Well, our glove is specified below 7.5 EU per pair” is an answer that can seal the discussion in one shot.

What makes that number defensible is that the glove does not buy it back elsewhere. It is clean-processed, washed repeatedly in deionised water, to a particle count below 1200 particles larger than 0.5 micrometres per square centimetre.

It is sterilised to a Sterility Assurance Level of 10 to the minus 6 in compliance with ISO 11137, certified as PPE Category III under Regulation (EU) 2016/425, and tested against EN ISO 374-5 for protection from bacteria, fungi and viruses.

And it does all of this in latex: the material chosen for tactile sensitivity, processed here to undetectable residual accelerator and a protein content specified as not detectable, so the two objections usually raised against latex are answered on the same datasheet. Every one of those lines is something you can cite in a contamination control argument, and none of them is the weak point that pays for the endotoxin figure.

Annex 1 did not ask you to buy a sterile glove. It asked you to defend, in a document an inspector will read, that every control keeps microorganisms, particles, and endotoxin away from the product. Sterility answers one third of that. Particles answer another third. Endotoxin answers the last, and it is the third most gloves treat as a label rather than a specification.

So when the next datasheet crosses your desk, do not stop at the word “sterile.” Find the endotoxin line. Ask whether the glove clears the standard or is specified beneath it, and ask what it gave up elsewhere to get there. The glove worth stocking is the one that gives up nothing.