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LSR Components: Why is LSR an Elastomer?

Plastics can be divided into uncross-linked thermoplastics and cross-linked thermosets. The first have intermolecular bonds between the molecule chains, but can move freely relative to their neighbors. They can be melted and solidified multiple times. In contrast, thermosets have “bridges,” or covalent, bonds interconnecting the polymer molecules.  Once the material is solidified by chemical curing, it cannot be melted again.