glue strength

[Shawn Brock]

Hey William,
thanks for sending this out.  I for one will look it up!  Your correct it 
will be a interesting read!  Brings to mind a question, have you or anyone 
elts used cold hide for key bushings?  I have just used hot hide but it 
seems cold hide would bee less messy.  Thanks again.
----- Original Message ----- 
From: "William R. Monroe" <pianotech at a440piano.net>
To: "Pianotech" <pianotech at ptg.org>
Sent: Monday, June 11, 2007 8:02 PM
Subject: glue strength


> Hello List,
>
> Interesting reading in the most recent Fine Woodworking magazine.  The 
> editors tested the following glues:
>
> Type I PVA (Titebond III) 100%
> Slow-Set Epoxy  99%
> PVA Glue (Elmer's Carpenter's Glue)  95%
> Liquid Hide Glue  79%
> Hot Hide Glue  76%
> Polyurethane Glue  58%
>
> The percentages are the average strengths of the various glues, relative 
> to the strongest glue (Titebond III).  These glues were tested for 
> strength using a bridle joint (picture one board with a slot cut into the 
> end, and a second board with a tongue that fits into the slot - boards at 
> 90 degrees to one another).  The tests were done for three different joint 
> fits:
>
> Tight, Snug, Loose
>
> The tests were done using the following woods:
>
> Oak, Maple, Ipe
>
> The glues were then ranked by averaging joint strength for all the 
> situations, and the results were enlightening.  I've listed them in order 
> of strongest to weakest above.
>
> Of particular interest to me were the results of Cold Hide vs. Hot Hide. 
> Based on Average strength, Cold Hide beat out Hot Hide glue (Cold Hide 
> rated 79% of the #1 glue's strength while Hot Hide rated 76%).  Hot Hide 
> apparently lost a lot of ground in the snug and loose Ipe joints, but the 
> editors remarked that they were "about equal."
>
> Worth the read, for sure.
>
> Enjoy,
> William R. Monroe
>
>
>