Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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That property which enables a material to be hardened, or fused and hardened, by means of heat. Materials having this property are called "thermosets." Once hardened they cannot subsequently be softened by reheating. The synthetic resins, according to the manner in which they react to heat, are classified as either thermosetting or thermoplastic. (179 , 233 )

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