How to Fill a Mylar Balloon With a Helium Tank

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A shiny Mylar balloon designed for use with helium has a self-sealing valve, so there's no balloon-tying involved. To inflate these balloons properly, fit them onto the nozzle of the helium tank; turn on the tank and slide each balloon off the tank nozzle once it appears fully inflated. Squeeze the self-sealing valve between your fingers to seal the balloon.

Filling a Mylar Balloon with Helium

Step 1

Locate the opening on the Mylar balloon. Slide the opening 1 to 2 inches over the nozzle on the helium balloon tank.

Warning

  • Some deluxe or professional helium balloon tanks have separate nozzles for latex and foil balloons. If your tank has two separate nozzles, inspect them both for markings that indicate which is for foil, or visit the manufacturer's website to determine which is which. Inflating a foil balloon with a latex nozzle may damage the balloon.

Step 2

Push the nozzle toward the tank while holding the balloon securely in place to begin inflating the balloon. On some models, the nozzle may be pushed down instead of back toward the tank.

Tip

  • Some helium tanks have a separate handle that must be turned counter-clockwise in order to release helium. To use this type of tank, turn the handle counter-clockwise, then place the balloon over the valve and press the valve back or down to inflate the balloon.

Step 3

Watch the balloon carefully as you inflate it. Slide the balloon off the tank nozzle once it appears nearly full, squeezing the area previously over the nozzle to keep it sealed. The pressure from your fingers seals the self-sealing neck of the balloon.

Tip

  • If you wish to tie ribbon onto the end of the sealed balloon, tie the ribbon beyond the end of the self-sealing portion of the neck, or else the tied ribbon may allow air to escape the balloon.

Refilling Mylar Balloons

You don't have to discard a Mylar balloon that has lost most of its helium. Instead, gently push the self-sealing balloon neck back over the nozzle of the helium tank and add more helium until the balloon looks nearly full again. If there's a ribbon tied onto the balloon, remove it before attempting to reinflate the balloon. You can even save foil balloons and reuse them. Empty out any remaining helium by placing a straw inside the self-sealing valve until the balloon deflates, and then smooth the balloon flat and fold it for storage.

Warning

  • Do not overinflate the balloon; it will stay inflated longer with slightly less helium inside. Overfilling may cause the self-sealing valve to fail.

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