Tightbond Creep

[Nichols]

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Terry,
     I'm not going to dispute information from the Web...... oh no! But.... 
I've done steamed and bent laminations of many varieties and configurations 
using Titebond. "Creep" has never been a problem. Much better working time 
for most applications. Lotsa time for vacuum applications! Major-league 
climate stress here, also. Titebond is the champ, for me.

Don't worry, be happy,
Guy Nichols

At 01:31 PM 4/27/2003 -0400, you wrote:
>Ran across the following on Homestead Finishing website: 
><http://www.homesteadfinishing.com/htdocs/glues.htm>http://www.homesteadfinishing.com/htdocs/glues.htm
>
>Yellow PVA Glues - Yellow PVA's were originally formulated to overcome the 
>negative aspects of white PVA's and are as close to an all-purpose 
>woodworking glue as you can get. Franklins Titebond and Elmer's 
>Carpenter's Wood Glue are both examples of this type. Some companies 
>market a version of yellow glue that is colored brown to be less 
>noticeable on dark woods.
>
>Yellow glues are really white glues that have been modified to have better 
>woodworking properties. They are less runny because they are thicker and 
>have a higher solids content (the ratio of resin to solvent.) They sand 
>better because the resin is harder and consequently doesn't gum up and 
>clog sandpaper.
>
>While yellow glues have a number of advantages, there are several 
>disadvantages you need to take into consideration. They have a short open 
>time of around five minutes so you have to work quickly. They also have a 
>high initial tack which makes re- positioning very difficult. Also, these 
>type of glues and the white varieties have poor creep resistance. Their 
>elastic nature allows them to slowly stretch under sustained loads. This 
>is a problem in bent lamination and load bearing assemblies like 
>structural beams. What happens is that the glue is so elastic it will 
>move, which results in eventual joint failure.
>
>Is this just urban legend or what? What I am especially concerned about is 
>laminated ribs, rib-to-panel, and bridge-to-panel joints with Tightbond. I 
>know its been stated that creep is not a problem, but I was rather 
>suprised to see the above on a website that otherwise seems to provide 
>pretty darn good information.
>
>Terry Farrell

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