styrofoam; expanded polystyrene
Commonly used for packaging, insulation, and craft materials. Often called 発泡スチロール in everyday Japanese, though technically a trademark.
I wrapped the fragile item in styrofoam before sending it.
We pack the fish in styrofoam boxes and ship them.
I wrapped the fragile dishes in styrofoam before shipping them.
The fishmonger carries fish and ice in styrofoam boxes.
The base of this model is made of styrofoam.