hard glue
A GLUE used in the
past in machine case-making where quick setting
was the principal requirement of the glue and
minimum flexibility was not a serious
disadvantage. Such glues are hard in the sense
that they contain no plasticizer. They were not
used for gluing-up the spine, lining-up, or for
flexible cover making, and are now seldom used in
book production for any purpose. (256 )
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