If you mean building foam (like Dow Blue foam or Pink foam) then no there should not be any chemical interaction to affect the plant. Will it work? You tell us after you try it
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)