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Old 07-08-2005, 01:26 AM
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You can't always go by the names things are sold under. The foam boards I bought for some fiberglass work were called "urethane foam" in the advertisement. They were actually polyisocyanurate foam, a.k.a. rigid insulation without any facing material. Another example: ever bought vinyl siding or tore a vinyl top off a car? Those are not "vinyl" but rather a polymer, most likely polyvinylchloride or plain old PVC.

As a follow-up to powderbill's organic chemistry lesson (thanks for that, powderbill!), see http://scifun.chem.wisc.edu/chemweek.../Polymers.html
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