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How long does it take foam - styrofoam - polystyrene to decompose?


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Answered 2017-07-20 08:05:04

Exposure to UV from sunlight will degrade the styrene molecule. Exposure to ambient ozone will also degrade the styrene molecule. In the sun, in a place with lots of ozone pollution, styrofoam falls apart in months. Built into refrigerators and ice chests, sealed away from ozone exposure with antioxidants built in, styrofoam will last for (probably) centuries. In a landfill, styrofoam usually lasts about a decade, depending on moisture and biological history.

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polystyrene foam (styrofoam cups and packaging materials) is soluble in acetone.It is not melted but dissolved.The acetone dissolves the long polymer strands releasing the trapped air(foam) and thus the structure collapses


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In a clean dry place out if the sun, never!


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Brass is a metal it does no decompose. Only organic materials can decompose.