Robin2.com
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Expanded polystyrene is a rigid closed cell/cellular plastic resin made from petrochemicals derived from crude oil. The resin is incorporated with the blowing agent pentane. During the pre-expansion, steam softens the plastic resin causing the pentane to expand the plastic into beads at least 100 times their original size.As long as the plastic is exposed to steam, the longer the pentane expands, therefore establishing the expanded size of the bead.[[Category:]]
