The Button Makes It Easy
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Trademark of No-Spill Inc. 

Does your gas can expand or contract?

It’s physics!  Substances expand or get bigger when they get warmer. They contract or get smaller when they are cooled. The substance that is expanding & contracting in your gas can are the gas fumes inside. The fumes expand & contract much more than the liquid gas.

We have to design gas cans to seal extremely well and not leak any hydrocarbons into the atmosphere or we are fined heavily and risk losing our certifications to build gas cans.

This is far different from a few years ago when gas cans openly vented into the atmosphere. The old can designs vented through their nozzles as well as a rear vent that was normally placed on the back of the can.

What can you do to stop this unwanted expansion and contraction?  Nothing will stop it—it is a law of physics. When heated, gas fumes expand; when cooled, they contract.

What can you do to minimize this? As much as possible, keep your gas can full of liquid gas, not fumes. Keep the gas can out of direct sunlight and away from temperature swings. You can always equalize the pressure in your NO SPILL can simply by pressing the button. Other cans require multiple actions.

Our testing: During every production shift a can is pulled from the line and is tested to 20 psi for 2 minutes to assure quality. Our patented nozzles are designed to release excess pressure; other nozzles on the market only get tighter with internal pressure. Never store your fuel cans near an ignition source and follow all warnings and cautions on the can.

A contracting can causes much more stress to its structure than an expanding can. If you have a contracting can that has constricted to a point where the corners or walls are permanently disfigured, you should replace the can as it may not be able to withstand the pressure required when the temperature heats up again.

Emission regulations gas can manufacturers must follow are extremely rigorous. Both the EPA and CARB (California Air Resources Board) allow almost zero emissions from gas cans. (Actually it is .3 of a gram per gallon per day and the testing takes about three months to complete.) The cans and nozzles now have to hold about 10 psi during testing to pass the regulations. These laws are in place to protect the environment; we have no control over these regulations.