glue strength

[Paul Chick (Earthlink)]

I read the same article.  Before passing judgement on Hot Hide Glue, go to
Bjorn Industries, and check the dozen or so Hot Hide Glues they manufacture.
It's available in 5 lb. lots. As I understand, some of it is very strong.
What's commonly available is a small percentage of what you can get.
Paul Chick
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