How should tags be stored before use?
Cool, dry, flat, dark, and with nothing heavy on top. The first four protect the adhesive and the substrate, which are what age. The fifth protects the antenna from a crease that leaves no visible mark and kills the tag before it is ever applied.
Five rules
Cool. Heat accelerates adhesive ageing and can bond the liner to the adhesive. A warm store is worse than a cold one and a vehicle is worse than either.
Dry. Paper substrates take up moisture and curl. Even film tags do better away from damp.
Dark. Sunlight through a window degrades substrates and adhesives, and a box near glass ages unevenly.
Flat. Rolls and sheets keep the antenna in the shape it was made in.
Unweighted. Nothing stacked on top, particularly not something with an edge.
Why flat and unweighted matters
A crease across an antenna breaks the loop, and a broken loop means a dead tag. That can happen in a stockroom as easily as on a workbench.
Nothing about it is visible afterwards. A creased tag looks identical to a good one, so the failure surfaces during writing, or worse, after installation.
Weight is the usual cause. A heavy item resting on a box of card tags, or a stack leaning against a corner, applies exactly the concentrated force that damages them.
Keep tags in their original packaging until use. It exists to hold them flat and to protect the liner, and repacking loose tags into a bag removes both protections.
Storing written tags
Written tags need everything above plus one more consideration: keep them separated from each other in a way that lets you find the one you need.
A bag of individually encoded tags with no order is a bag you will have to read one by one. Sorting them at the point of writing costs minutes and saves hours.
Label the container with what is in it, including which batch and which content. A box marked only "NFC tags" is a box someone will have to read through.
And if the tags are locked, mark that clearly. A locked tag that reaches a workbench as a blank wastes someone's time and cannot be recovered.
What to store alongside
The delivery date, the quantity, the chip reference and the tag type. Written on the box, not only in an email.
One unwritten reference tag per batch, labelled. It is the fastest way to compare a suspect delivery against a known good one.
And a note of anything unusual observed on arrival. The observation that a batch felt different is worth recording at the time, because it will be the first thing you want a year later.
Frequently asked questions
Does a fridge help?
Cool storage helps and condensation does not, so a fridge introduces a problem it does not solve. A stable room temperature away from heat sources is better.
Can I store tags loose in a bag?
It invites creasing and loses the liner protection. Original packaging holds them flat, which is the main thing storage has to achieve.
How long can written tags sit before deployment?
As long as the adhesive allows, since the data does not age. Test adhesion on old stock before applying it.
Should tags be kept away from magnets?
There is no need. Tags store data electrically rather than magnetically, so a magnet has nothing to erase.