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Re: Fish glue



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This begs an interesting problem... how strong should bookbinding glue be?

Woodworking magazines have often tested various sorts of glue by testing
joints to destruction. When the wood is splintered, then the glue is
stronger than the wood being joined.

But in bookbinding, do we want the joint to fail at the glue joint or by
tearing the paper? Are there places - tipping on an illustration, for
example - where a weak adhesive is preferable?

And what sort of joint strength can paper support? It seems to me that fish
glue - in the form of stamps or gummed envelopes - can be easily be stronger
than the paper it is joining.

From: "Jack C. Thompson" <tcl@TELEPORT.COM>
> Congratularions, Yehuda!
>
> Nice score.
>
> Never heard of "1001 Uses for Fish Glue" but there are a couple of
> things to keep in mind about using fish glue in binding (aside from
> attracting cats, as Betty noted).
>
> Platemaking fish glue is of the highest quality made, but the best
> is still only about as strong as a medium hide glue.
>
> According to a test reported in Jerome Alexander's book, _Glue
> and Gelatin_ a commercial fish glue developed a joint strength
> of 260 lbs. per sq. inch, while a high-grade hide glue should
> develop something like 1700 - 1800 lbs. per sq. in.
>
> Enjoy,
>
> Jack
>
> Thompson Conservation Lab.
> 7549 N. Fenwick
> Portland, Oregon USA
>
> 503/735-3942  (ph/fax)
>
> http://home.teleport.com/~tcl
>
> "The lyfe so short; the craft so long to lerne."
> Chaucer  _Parlement of Foules_ 1386
>
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