Properties of expanded polystyrene foam
http://www.cutcnccam.com/article-show-201111291010304.shtml
Expanded polystyrene foam has certain desirable properties because of its structure.
Expanded polystyrene foam is extraordinarily light and buoyant, and a good insulator against heat and sound. It can be used as a building material or a design element, and can be molded into many shapes for a number of household uses as well.
In most cases, expanded polystyrene foam is white and is composed of small, interconnected beads. It is made by combining the chemicals ethylene and benzene, to make a compound known as styrene. The styrene of expanded polystyrene foam is then treated with other chemicals which cause the styrene molecules to polymerize, or to group together in long chains.
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