In the paper mache art group I am in (PaperMacheArt) a question come up how to bond Styrofoam to paper pulp, if it was possible to make insulted pulp. As I was about to embark on some pulp experiments of my own I took up the challenge myself too.
Well having three types of Styrofoam laying around to experiment with I instantly hit problems. I have the small pellet type used in bean bag cushion fillers, the same pellet type which has been moulded into blocks of various shapes & sizes as well as the more melted foam type which looks more like melted nylon than Styrofoam. Anyway my immediate problem was shredding the stuff. I have a very powerful large blender but sadly it was just not up to the challenge. Even when I slowly added the Styrofoam pellets to some premade paper pulp. No success as you can see below.
In the end I had a sizeable batch of ruined pulp so rather than throw it away I figured why not just try to make some bowls from it. So I did. They took a few days to dry but the results were unexpected.