There is a tendency to utilize underground space for the less ornamental purposes of civilization; there is the Metropolitan Railway in London, for instance, there are new electric railways, there are subways, there are underground workrooms and restaurants, and they increase and multiply.
Polystyrene can be naturally transparent, but can be colored with colorants. Uses include protective packaging (such as packing peanuts and CD and DVD cases), containers (such as clamshells), lids, bottles, trays, tumblers, and disposable cutlery.
Features. Polyethylene foam is a strong and resilient closedâcell foam, ideally suited as a shockâabsorbing material in packaging and padding. Polyethylene closedâcell foam is available in sheets, cylinders, and tubes that are great for expansion joint filler (backer rod), insulation, buoyancy components, and packaging.