Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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glass transition temperature

That temperature at which an adhesive loses its flexibility and becomes hard, inflexible, and "glasslike." An adhesive which reaches the "glass transition temperature" is subject to failure if flexed. Glass transition temperatures for adhesives vary greatly, from 105° C. (polymethyl methacrylate) to well below 0 ° C. If flexibility is required of the adhesive, the glass transition temperature can be lowered, either by means of plasticizers, or a polymer with a naturally low glass transition temperature.

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