Polyurethane Hot Melt Vs EVA Glue II
While polyurethane hot melt is slightly more expensive than EVA glues, it produces a much stronger, more flexible binding. Thus, the pricing between the two options becomes a wash. Unlike the white or amber color of EVA, polyurethane hot melt is clear, and since less is required, it yields a much more aesthetically pleasing final product. Due to polyurethane hot melt binding uses smaller amount of adhesive over EVA binding, it also means that you can achieve a square spine on even the thinnest of books.
Polyurethane hot melt glue is more durable and flexible than EVA glue, and once the glue has set, it is almost impossible to tear a page out of the book. In addition, polyurethane hot melt is not susceptible to re-melting or cold-cracking issues. As stated, EVA is specifically designed to be re-activated when heated. Thus, if a book is placed in extreme heat, it can melt again. And in extremely cold temperatures, it can become brittle and crack. In each case, the integrity of the spine becomes compromised, and the binding will fail.
In contrast, once the polyurethane hot melt is in its final solid state when applied to the book, it can never be re-activated. This is vital to consider when the final destination of a book is unknown. Consider what might happen to books in such extremes as Arizona in the summer or Alaska in the winter, and this distinction becomes clearer.
Although both options are available, most manufacturers now are more likely to use polyurethane hot melt adhesive to bind books. While EVA has some positives, with the advances in printing technologies and the more prevalent use of exotic stocks for printing, there is no question that the polyurethane hot melt adhesive is the better option.
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