Chemicals are mixed together to make the foam and those chemicals cant be un-mixed. Once the foam takes shape it can be further shaped by reduction but not addition without the use of adhesive. The foam can be melted down with acetone and reformed like dough that will dry into a harder denser plastic, but I dont know how economical that is. It is usually only for DIY purposes.
Mycelium (the part of mushrooms that grow underground) can be grown in molds and used in place of foam is a much more eco friendly and cost effective solution than finding a way to reuse foam would be.
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