4 min read
How long do helium balloons float?
Latex gives you 8 to 12 hours. Foil gives you days. Everything else is detail — but the detail is what decides whether your display is still up when the guests arrive.
The short answer
An 11 or 12 inch latex balloon filled with helium floats for roughly 8 to 12 hours. An 18 inch foil balloon floats for several days, often more than a week indoors.
That gap exists because latex is porous. Helium is a very small molecule and it escapes straight through the balloon wall. Foil is a metallised film with a far tighter structure, so the gas leaves far more slowly.
What shortens float time
Heat is the main one. A warm room makes gas expand and escape faster, and direct sun on a latex balloon can halve its life. Cold does the opposite — balloons look slack in a cold room and firm up again as it warms.
Size matters more than people expect. A small balloon has more surface area relative to the gas inside it, so a 9 inch latex will go down noticeably sooner than a 12 inch.
Over-inflating stretches the latex thinner and speeds up the loss. Fill to the balloon's natural shape rather than to maximum size.
How to make them last longer
Hi-Float is the reliable answer. It is a liquid you coat the inside of the balloon with before filling, and it seals the pores. Treated latex goes from 8 to 12 hours out to 2 or 3 days, which is what makes decorating the night before possible.
The other answer is not to use helium at all. Air-filled latex lasts a week or more, and every garland, arch and column you have admired was almost certainly air-filled and fixed to a frame. Helium is only necessary when something has to float unsupported.
Common questions
- Do foil balloons need Hi-Float?
- No. Foil already holds helium for days, and Hi-Float would not adhere to the film anyway. It is a latex product.
- Why did my balloons go down overnight?
- If they were latex and untreated, that is normal — 8 to 12 hours is the expected life. If they were foil, the room probably got cold; check again once it has warmed up before assuming a leak.