Some foil balloons are made with self-sealing valves and others are made without valves depending on the size of the balloon. Balloons without valves– also called air-fill or mini foil balloons– require heat sealing once they have been inflated. Professionals generally use heat sealers to seal balloons, however, you can use a flat iron or curling iron, if done correctly, to seal the balloon.


Instructions for heat-sealing with a Heat Sealer

  1. Turn on the heat sealer and choose a low heat setting. Wait for the sealer to heat up.
  2. Inflate the balloon with a hand pump while pinching the neck of the balloon around the tip of the pump.
  3. Pump until fully inflated.
  4. Insert the neck of the balloon between the lever of the heat sealer.
  5. Press down and hold the lever closed for 5 seconds.
  6. Release the lever and remove the balloon.

Instructions for Heat-Sealing with a Flat/Curling Iron

  1. Wrap the plates of flat/curling iron with tin foil. this will keep the iron and balloon from being damaged.
  2. Warm up the iron up to the lowest heat setting. 
  3. Inflate the balloon with a hand pump while pinching the neck of the balloon around the tip of the pump.
  4.  Hold the balloon neck between the plates of the flat/curling iron for 5 seconds and then release the handle. 
  5. If the balloon does not seal the first time then heat can be increased gradually.