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Term:  polystyrene foam



Sometimes referred to by one of the major brand names: Styrofoam and Foamular, as craft foam, or simply as 'polystyrene', polystyrene foam is available in various densities:

Low density polystyrene foam, usually white, is frequently used as a packing material either in the form of moulded inserts or as chips. Denser varieties are most commonly employed in the building industry as thermal insulation.
Note that polystyrene is also commonly available in another form which sometimes gets referred to as styrene. This is the hard plastic from which model kits are commonly moulded.

Click here for information on where to obtain polystyrene foam.

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