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emmalazarus's avatar

Which plastics can helium support?

Asked by emmalazarus (4points) March 2nd, 2011

I’m trying to make an inflatable, helium-filled sculpture, but don’t know much about the material. Can I inflate plastic-bag material (high density polyehthylene)? Or is there a more favorable material i could use?

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3 Answers

Cruiser's avatar

Most if not all plastics are porous and Helium is a small molecule and will pass through the plastic over time. You could try sealing the sculpture with a sealer and that my help contain the Helium longer but I would not plan on forever. A refillable bladder may make some sense if this sculpture will need to have the Helium long term. Party stores use a liquid sealer in their balloons to give them long float time of sometimes weeks with the Mylar balloons going even longer.

anartist's avatar

Mylar is the plastic of choice.

CyndyWithaY's avatar

Can I contain helium in a plastic material to be released at a later date? Will Mylar do it?

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