Most foil balloons have a self-sealing valve, so you can fill them with ordinary air using a drinking straw or a pump with a narrow nozzle. Fill to about 80 to 90 percent, pull the straw out, and the valve closes itself. The one thing air can’t do is make the balloon float, so plan how you’ll hang or mount it before you start.
Why fill a foil balloon with air?
Helium isn’t always easy to get, and for a lot of decorating you don’t need it. An air-filled foil balloon taped to a wall behind a cake table, tied to a chair, or hung from the ceiling on clear line looks the same in photos as a floating one. It also lasts: indoors, an air-filled foil balloon often stays full for a week or more, because air leaks out of the film far more slowly than helium does. For how foil and latex compare on float time and reuse, see foil vs latex balloons.
What you need
- A self-sealing foil balloon (check the listing or the neck for a thin internal sleeve)
- A straight drinking straw, or a hand or electric balloon pump with a narrow cone nozzle
- Ribbon, tape, glue dots, fishing line or a stick, depending on how you’ll display it
- Scissors to trim ribbon and the straw if it’s very long
Several of our foil balloons include ribbon: the 30 x 24 inch smiley face birthday balloon and the 24 x 20 inch Feliz Cumpleaños gift box balloon each come with 33 ft, and the 30 x 20 inch snail balloon with 32.8 ft. All three have self-sealing valves and can be filled with air or helium. Pumps and helium aren’t included.
Straw, hand pump or electric pump?
| Method | Suits | Watch out for |
|---|---|---|
| Drinking straw | One to three balloons; small and medium shapes | Slow for 30-inch shapes; use your own straw rather than sharing one |
| Hand pump, narrow cone nozzle | Several balloons; large shapes | Push the nozzle in only as far as needed so it doesn’t tear the sleeve |
| Electric pump, slim nozzle | A dozen or more balloons | Overfills in seconds; use short bursts and finish by hand |
| Ball-inflating needle | Not suitable | The metal needle can puncture the valve sleeve |
| Hair dryer or air compressor | Not suitable | Heat can melt seams; compressors overfill and split them |
How to fill it: the details that matter
Getting past the valve
The valve is two thin layers of plastic that press together when the balloon is full. A straw only works if it goes in far enough to hold those layers apart, past the narrow point where the sleeve meets the balloon body. If air puffs back out at your mouth, push the straw in a little further.
Filling shapes evenly
Shaped balloons like cakes, animals and gift boxes have narrow sections that fill last. Pause partway and gently press air from the full areas toward the flat ones. On animal and character shapes, heads, tails and limbs are usually the last parts to fill, so smooth air toward them before you top the balloon up.
How full is full?
Stop when the balloon holds its shape but the seams still have a few soft wrinkles. That’s the 80 to 90 percent the instructions usually mean. A drum-tight balloon looks good for a moment, then splits a seam when the room warms up or someone squeezes it. If you overdo it, slide the straw back in and let a little air out.
Sealing
Keep the neck pinched while you remove the straw. Then run two fingers along the valve from the balloon end toward the opening; this flattens the inner flap so the pressure inside holds it shut. You don’t tie the valve itself. Tie ribbon around the neck below the valve, or through a hanging tab if your balloon has one.
How to display air-filled foil balloons
Because air-filled foil balloons sink, the display method is part of the plan. Here are the most common options:
| Look you want | How to do it |
|---|---|
| Floating in mid-air | Tie clear fishing line or the included ribbon to the neck and hang it from a ceiling hook, curtain rod or light-duty removable hook. |
| Flat on a wall or backdrop | Use loops of tape or glue dots on the back; test them on a hidden area of painted walls first. |
| Standing on a table | Tape the neck to a slim dowel or balloon stick and stand it in a vase or cup weighted with sand or pebbles. |
| Part of a garland | Attach it to a latex garland with glue dots or a ribbon tie; see the balloon arch strip guide. |
| Gift or chair topper | Tie it with ribbon to the gift, chair back or table leg. |
A balloon like the 22.4 x 14.5 inch birthday cake foil balloon is small enough to tie to a wrapped gift or hang behind a cake stand, while 30-inch shapes work well on a wall or hanging at eye level.
Placement tips for party day
- Inflate the night before. Air-filled foil doesn’t lose lift the way helium balloons do, so you can fill everything ahead of time, check it in the morning, and top up any soft ones with a few breaths.
- Hang at eye level. For photos, center a large shape roughly at the height of your guests’ faces, or slightly lower behind a cake table so it appears over the cake.
- Keep away from heat and moving air. Sunny windows, heaters and lamps make the air inside expand, which strains the seams. Ceiling fans and vents spin hanging balloons and can tangle the line.
- Turn the message to face the room. Hanging balloons slowly rotate. A second line, or a small loop of tape on the back, keeps the printed side facing forward.
Troubleshooting
- It deflates as soon as the straw comes out. The inner flap didn’t close. Press the valve flat from the balloon end outward. If it still leaks, refill and fold a small piece of tape over the valve opening as a backup.
- It’s soft the next morning. A cooler room makes the air contract, and a slow leak at a seam does the same. Warm the room or top it up with a few breaths.
- Air won’t go in. The straw isn’t past the narrow neck, or the sleeve is folded inside. Pull out, flatten the sleeve, and try again.
- A seam split. It was overfilled or got hot. Seams can’t be repaired reliably, so keep that balloon for a flat wall display or replace it.
Can you add helium later, and can you reuse it?
If you change your mind and want it to float, empty the balloon completely first, then fill it with helium. Any air left inside adds weight and cuts lift, and a large shape may not rise at all. To reuse a balloon, slide a straw in past the valve, press the air out gently, and store it flat without sharp creases.
Safety notes
Keep uninflated balloons and torn pieces away from young children, who can choke on them. Trim long ribbon tails near babies and toddlers. Outdoors, keep foil balloons tied down and away from overhead power lines, since the metallic film conducts electricity. More decorating supplies for the day are in our balloons and garland supplies collection.
Step by step
- Find the valve
Lay the balloon flat and locate the thin plastic sleeve at the neck or tail. Gently separate the sleeve's opening with a fingernail if the two sides are stuck together.
- Insert the straw or nozzle
Slide a straight drinking straw or a slim pump nozzle into the sleeve until it passes the narrow point where the valve meets the balloon body.
- Inflate slowly
Pinch the neck around the straw and blow or pump in steady breaths or strokes, letting the air spread into every part of the shape.
- Stop at 80 to 90 percent
Stop when the balloon is full but not drum-tight. Small wrinkles along the seams are fine; stretched, shiny-flat seams mean too much air.
- Seal the valve
Keep pinching as you pull the straw out, then run your fingers along the valve from the balloon toward the opening so the inner flap lies flat and closes.
- Hang or mount it
Tie ribbon to the neck below the valve or through the hanging tab if there is one, then hang, tape or mount the balloon where you want it.
Frequently asked questions
Will a foil balloon float if I blow it up with air?
No. Your breath and pump air are heavier than helium, so the balloon will rest or hang wherever you put it. Use fishing line from the ceiling or a weighted stick if you want it to look like it's floating.
Can I use a bike pump or ball pump on a foil balloon?
Only with a cone-shaped or slim plastic nozzle that fits inside the valve sleeve. Don't use the metal needle meant for sports balls; it can pierce the sleeve. Bike pumps also move a lot of air per stroke, so go slowly.
How long do air-filled foil balloons stay inflated?
Indoors, often a week or more, and sometimes much longer, because air leaks through the film far more slowly than helium. Heat, cold, sharp folds and pinholes shorten that.
Do I need to tie a knot in a self-sealing foil balloon?
No. The inner flap seals itself when you press the valve flat. Tie ribbon around the neck below the valve or through the hanging tab, not in a knot across the valve opening.
Why won't my foil balloon stay inflated?
Usually the straw was pulled out before the flap could close, or the flap is folded. Press the valve flat from the balloon end toward the opening. If air still escapes, a slow leak at a seam or a pinhole is likely, and a strip of tape over the valve can help only with valve leaks.
Can I fill an air-filled foil balloon with helium afterward?
Yes, but empty it completely first. Leftover air adds weight and reduces lift, and a large shape with a lot of air in it may not float.
How do I deflate a foil balloon to save it?
Slide a straw into the valve past the narrow neck so the flap opens, then press gently from the far end toward the valve. Store it flat in a folder or box and avoid hard creases.
