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It depends on what type of foam it is and where it is: whether it's exposed to head, humidity, open air, etc. I carried a polyurethane mattress out of an old person's spare bedroom in 2010. It had been purchased in the 1960s and had turned mostly to a granular, sand-like material. Thankfully it was enclosed within a zipped mattress cover or it would have been a huge mess. I have also seen the polyurethane within a 20-year-old house door granulate and pour out the bottom, likely assisted by burrowing insects.

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12y ago
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4mo ago

Low density polyurethane can take hundreds of years to decompose as it is a synthetic material that is not easily biodegradable. Its decomposition rate varies depending on environmental conditions such as temperature, sunlight exposure, and microbial activity. Recycling and proper disposal are recommended to minimize its environmental impact.

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Q: How long does it take low density polyurethane to decompose?
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