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There are two main types of decorative balloons: Mylar® (a shiny, foil-like plastic made of polyester) or latex (a flexible material made from liquid rubber). Which one lasts longer? Why?
Which type of balloon lasts longer: Mylar® or latex?
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The latex balloon should have sunk to the ground after a couple of days. The Mylar® balloon should have stayed floating—in fact, they can float for as long as a week or two after being inflated.
Latex is porous—meaning it is filled with thousands of microscopic holes. When you inflate a latex balloon, you’ll notice that the latex gets thinner. What you aren’t able to see is the fact that you’re also stretching these tiny holes to be even wider! So what happens? The helium you inflated the balloon with gradually seeps out through these holes, and the balloon starts to sink to the floor.
Mylar® is a trademarked material invented by DuPont Teijin Films, and is sometimes used as a generic word to refer to many balloons manufactured using similar foil and polyester materials. Balloons made out of these types of material aren’t porous, they’re airtight—meaning gas isn’t able to escape through the material itself. Helium might be able to escape through the neck seal, but if it’s sealed tightly enough, this tends not to be a problem.
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