| A lightweight foam polymer, usually polystyrene or polyurethane, forms the core of the surfboard. |
| The polymer polystyrene contains the phenyl group as part of its repeat unit. |
| The PVA solution was deposited in polystyrene molds under the force of gravity in a darkened room. |
| I must say I thoroughly enjoyed learning to swim on my back with one of those squeaky polystyrene float things. |
| In this process, water passes through a media bed, usually sulfonated polystyrene beads. |
| The resulting spark can ignite the Pentane vapour liberated from the expanded polystyrene block by the cutting operation. |
