How Long Does Franking Ink Last? Storage Tips 2026

A franking cartridge that dries out before you have used it is money posted straight into the bin. This guide explains how long franking ink really lasts, why cartridges fail early, and how to store yours so every millilitre ends up on an envelope rather than wasted. Follow these steps and you will buy ink less often, avoid faded imprints, and keep your mailroom running without last-minute panic orders.

How long does franking ink last?

Nearly every modern franking machine uses a thermal inkjet cartridge, the same basic technology found in desktop inkjet printers. That means franking ink has a shelf life, whether it is sitting in a drawer or fitted in the machine.

Kept sealed in its original packaging and stored correctly, an inkjet cartridge typically stays in good condition for around 18 to 24 months, and often up to two years or more. Once you open the foil or fit the cartridge, the clock speeds up because the print nozzles are now exposed to air.

The amount of ink you get through also matters. Manufacturers quote an imprint yield, for example a few thousand impressions per cartridge, but that figure assumes you print regularly. If your machine sits idle for weeks, ink can dry in the nozzles long before you reach the rated yield, so low-volume mailers often replace cartridges on age rather than because the ink has run out.

Why franking ink dries out or fails early

Franking cartridges print through microscopic nozzles. When ink is not moving through them, it begins to thicken and clog, which shows up as streaky, patchy or faint imprints. Royal Mail can reject mail with a franking mark that is not clear and complete, so a drying cartridge is a real operational risk, not just an annoyance.

The most common causes of early failure are heat, sunlight, a broken seal and long periods without printing. Even a tiny pinprick in the foil packaging lets air in and starts the ink drying, which is why a cartridge can arrive apparently unused yet perform poorly. Extremes of temperature, such as storing spares near a radiator or on a sunny windowsill, thicken the ink and shorten its life.

How to store franking ink cartridges correctly

Good storage is simple and costs nothing. Keep spare cartridges in their original sealed packaging until the moment you need them, and only break the seal when you are ready to fit the cartridge.

Store cartridges somewhere cool, dry and out of direct sunlight, ideally between roughly 0C and 35C. A stationery cupboard or a drawer away from heat sources is ideal. Keep the cartridge the right way up, in line with any arrows on the box, so ink does not pool against the seal.

Buy in sensible quantities too. Bulk buying ink can feel like a saving, but if you cannot use it inside the shelf life you are simply paying to store ink that will expire. Match your order to how much you actually frank, and note the date you receive each cartridge so you can use older stock first.

How to make a fitted cartridge last longer

The single best way to protect a cartridge that is already in the machine is to print regularly. Running even a few items through each week keeps ink flowing and stops the nozzles clogging. If you know the machine will be idle over a holiday period, run a test imprint before you leave and again when you return.

Most machines have a cleaning or nozzle-purge routine in the menu. If imprints start to look faint or streaky, run that cycle before assuming the cartridge is finished, as it often clears a partial blockage and restores a clean mark. Keep the print area free of dust, and wipe up any spilled sealing solution promptly, because damp and residue around the print head can affect quality.

When imprints stay poor after cleaning, or the machine reports the ink is low, it is time to replace the cartridge rather than risk rejected mail. Always fit the correct cartridge for your exact model, as inks are not interchangeable between machines.

Buying the right ink for your machine

Franking ink is model-specific, so the cartridge that fits a Mailcoms machine will not fit an FP Mailing or Frama model. Ordering by machine make and model is the quickest way to avoid a wasted purchase.

You can browse ink by brand, for example Mailcoms inks and labels or FP Mailing inks and labels, to find the exact cartridge for your device. If you frank onto adhesive labels rather than directly onto post, stock up on franking labels at the same time so you never run short mid-run. It is also worth keeping compatible business envelopes on hand for a clean, consistent imprint.

Frequently Asked Questions

Does franking ink expire?

Yes. Franking ink is a thermal inkjet ink and has a shelf life, typically around 18 to 24 months when the cartridge is sealed and stored in a cool, dry place. After that the ink can thicken, dry in the nozzles and produce faint or patchy imprints, so it is best to use cartridges well within their shelf life and rotate older stock first.

How should I store spare franking cartridges?

Keep them in their original sealed packaging until you need them, stored upright somewhere cool, dry and out of direct sunlight, ideally between roughly 0C and 35C. Avoid radiators, windowsills and damp areas, and never puncture the foil seal, as even a pinhole lets air in and starts the ink drying out.

Why is my franking imprint faint or streaky?

Faint or streaky imprints usually mean the print nozzles are partly clogged, often because the machine has not printed for a while or the cartridge is near the end of its life. Run the machine's cleaning or nozzle-purge routine first, and if the mark is still unclear, fit a fresh cartridge, since Royal Mail can reject mail whose franking impression is not clear and complete.

Can I use ink from another franking machine brand?

No. Franking cartridges are designed for specific makes and models and are not interchangeable. Always order the ink listed for your exact machine to guarantee a proper fit and a compliant imprint.

The bottom line

Franking ink is a small cost that can cause big problems when it dries out at the wrong moment. Store spares sealed, cool and dry, print regularly to keep fitted cartridges healthy, and replace the ink the moment imprints start to fade. A few simple habits mean clearer marks, fewer rejected items and less money wasted. When you are ready to restock, browse our full range of franking inks, labels and envelopes to find exactly what your machine needs.