Butane canister expiry date: how to read it and check canisters before use

When buying butane canisters, many people look for an expiry date as they would on food but cannot find one, or only see a string of hard-to-read numbers on the base of the canister. The butane canister expiry date is not like a food use-by date: the gas inside does not “go off”; what deteriorates over time is the seal, the valve and the shell. Below is how to read the information, check canisters and deal with expired ones.

Where are the production date, expiry date and batch code printed?

Each manufacturer marks them in its own way, usually in one or more of the following places:

• The base of the canister: a stamped or inkjet-printed string of numbers including the production date and batch code.
• The body of the canister: printed with the label, near the manufacturer’s name and the warnings.
• The carton: showing the production date, batch code, specification and number of canisters.

Some brands clearly mark “NSX” (production date) and “HSD” (expiry date), while others only give the production date along with a recommended shelf life on the label. If the numbers are hard to read, ask the distributor. A canister with no manufacturer, date or batch information is a sign to stay away — see how to spot poor-quality butane canisters.

What does shelf life mean for a pressurised canister?

Butane is a stable hydrocarbon; it does not spoil or degrade like food. The shelf life printed on the canister is mainly the period for which the manufacturer guarantees the sealing parts and the shell:

• Seal and valve: rubber and plastic materials gradually age, especially in hot, humid conditions; a hardened seal can easily cause a gas leak when the canister is fitted to the stove.
• Thin steel shell: if kept for a long time in a damp place, the shell may rust at the base and along the seams.
• Tightness: a well-sealed canister loses almost no gas; a canister that has become noticeably lighter after a period in storage is a sign of a slow leak.

A canister within its shelf life can still fail if stored incorrectly; an expired canister is no longer guaranteed by the manufacturer even if it looks normal. The exact shelf life depends on the brand.

Check the canister before fitting it to the stove

1. Read the information: look at the butane canister expiry date, or the production date along with the recommended shelf life; set expired canisters aside.
2. Look at the shell and valve: set aside and do not use any canister that is dented, rusty, bulging, missing its cap or has a damaged locating notch — the detailed signs are in the article on spotting poor-quality canisters linked above.
3. Smell: if a canister smells of gas before it is even fitted, take it outdoors, away from flames and electrical sources.
4. When fitting it to the stove: if you hear hissing or smell gas, remove the canister immediately and do not light the stove.

The steps for fitting the canister, using the stove and turning it off are covered in how to use a portable gas stove safely.

Stock rotation for shops: first in, first out

For shops, the rule is first in, first out: sell older batches first, and separate batches close to expiry to prioritise selling them or discuss them with the distributor. For dating cartons on receipt, stacking and keeping the stockroom in the right conditions, see how to store butane canisters; for ordering by season, see running a mini gas business.

What should you do with expired canisters?

• Stop using them, even if they look fine; shops should not sell them to customers.
• Do not release the gas indoors yourself, do not puncture or burn them; keep them separately in a cool, well-ventilated place, clearly marked “do not use”.
• Shops should contact the distributor for instructions on returns; households should follow local waste collection guidance.
• Do not take canisters to be refilled — for the reasons, see can butane canisters be refilled.

Besides the expiry date, the canister must also suit the stove: our article on which mini gas canister fits which stove compares 220–250g canisters with 120g ones and explains what to do when a canister will not lock into the stove.

Frequently asked questions

Written by the VietnhatGas technical and sales team — a batch manufacturer of LPG cylinders. This content is for reference; regulations and standards may change, so please check the current texts.