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Thermosetting:
Thermosetting plastics are made
of chains which have been linked together, refered as
cross-linked. They have a three-dimensional network of
molecules and will not soften when heated. They are
insoluble, fireproof, and usually hard and brittle. These
plastics cannot be reused. The
common thermosetting plastics are
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Allylics
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Epoxies
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Melamines
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Phenolics
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Polyesters
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Silicones
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Ureas
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