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How Do Balloons Lose Helium?

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By Denise Bertacchi
eHow Contributing Writer
(0 Ratings)
From Quick Guide: Basics of Balloons

    Leakage

  1. Helium balloons deflate over time as they lose gas through the walls and imperfections in the sealed neck of the balloon.
  2. Latex

  3. Latex balloons are more porous and allow the helium to leak out more rapidly. Unless coated with a special sealant, latex balloons will deflate in 8 to 12 hours.
  4. Mylar

  5. Mylar balloons can hold helium for much longer, usually several days. The helium will still escape the Mylar balloon through microscopic leaks in the neck of the balloon.
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