Elapor is a kind of foam, similar polystyrene and used to make packing elements for electrical items. It is made from small beads that are placed in a mold and then expanded to form the shape of the mold.
Elapor is also a popular material with which to manufacture remote control aircraft, due to its durability. If crushed, elapor can be made to re expand to near its original shape by immersing it in, or pouring over it, boiling water.