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.
Sintra PVC Foam. Sintra PVC Foam board is a very durable pvc sheet. Sintra PVC Foam is for photo mounting, display construction and a variety of other uses. Excellent for outdoor use. Sintra PVC is also available with a self-adhesive peel and stick film for mounting.