Adhesive Pot Life and Storage - What Really Counts?
Pot life, working time and shelf life decide the quality of every bond. This guide explains how these times relate, why every 10 °C rise roughly halves the pot life, and how cool storage plus batch control protect the usable working window.
View adhesivesPot life, working time and shelf life - what is the difference?
The three time figures describe different phases. Pot life is how long a mixed two-component adhesive stays workable in the container. Working time (open time) is how long the applied layer may stay open before the parts are joined. Shelf life applies to the unopened container before mixing.
Pot life and working time both depend on the same chemical reaction: once hardener and resin are mixed, curing begins. The larger the mixed batch, the more the mass heats itself through the exothermic reaction, and the shorter the pot life becomes.
- Pot life: workable in the mixing cup, measured by rising viscosity.
- Working / open time: the joining window after application.
- Set time / handling strength: until the part can be handled.
- Shelf life: the limit in the unopened original container.
How does temperature affect pot life and shelf life?
Temperature is the strongest lever. As a rule of thumb (the reaction rate roughly doubles per 10 °C), warming the adhesive by 10 °C halves the pot life. Conversely, cool storage extends the usable time considerably.
Shelf life follows the same principle. An adhesive rated for twelve months at 25 °C loses much of its working reserve at a constant 35 °C. Cyanoacrylates and many hardeners are also sensitive to humidity, so tightly closed containers and dry storage are mandatory.
How do storage and batch control protect the usable working window?
Shelf life is valid only under the conditions the manufacturer states, typically 5 to 25 °C, dry and in the unopened original container. Every batch carries a manufacturing date and a best-before date. Withdrawing stock by the FIFO principle (first in, first out) uses older batches first and avoids overstorage.
- Record batch number and expiry date at goods-in.
- FIFO: take and use the oldest batch first.
- Store chilled stock separately and labelled (5‑10 °C).
- Date opened containers and use them up quickly.
- Test a sample bond of the batch before critical joints.
Frequently asked questions
What is the difference between pot life and working time?
Pot life is how long the mixed adhesive stays workable in the cup. Working time is the joining window after application, before the surface skins over and can no longer wet the parts properly.
Why does pot life shorten with larger batches?
Curing is exothermic. In a larger mass the heat builds up, temperature rises and the reaction speeds up. It is better to mix several small batches or to cool the cup.
Does refrigerated storage extend shelf life?
For many adhesives yes, because low temperature slows the reaction. The key is to warm the closed container to room temperature before opening so no condensation forms. Always follow the manufacturer data, not every adhesive tolerates cold.
What does FIFO mean in adhesive storage?
First in, first out: the batch delivered earliest is consumed first. This way no container sits until its expiry date and the usable working reserve is fully exploited.
Looking for adhesives with clear batch control?
We supply adhesives and sealants with documented manufacturing and expiry dates plus data on pot life and storage conditions.
Batch traceability
Every container with batch number and expiry date.
Cool stored
Temperature-sensitive stock kept correctly.
Fresh stock
FIFO withdrawal secures usable working reserve.
Expert advice
Our team helps with pot life and application.