http://www.mahoodsculpture.com/foam-sculpture-how-to/

Does anyone know the difference? Styrofoam? Extruded or styrene expanded beads?
I have four large “loaves” of styrofoam (10″ x 21″ x 60″) from Dow Chemical that might be used for flotation or for sculpture. I want to know how this material is different from expanded polystyrene foam beads that are used in bean bag chairs and also formed into ice chests and cups, etc.
Anyone need about fifty cubic feet of styrofoam?
They are chemicaly the same
Game Terrain – snake wall obstacle – Foam carving Part 4