Titebond Liquid Hide Glue specs...was the glue

[Farrell]

I stand corrected. I just received a response from Franklin technical:

"The Titebond Liquid Hide Glue will soften with high humidity, often above 60%. Most pianos don't see that extreme, even in Tampa, where humidity is high."

So I guess it is most reasonable to believe the part about liquid hide being affected by high humidity. I have monitored my home extensively and for a good part of the year the RH is between 60% and 75% - so whereas I have to believe what they say about the glue characteristics, they are incorrect about common indoor RH.

So now for the practical question: So HOW MUCH does liquid hide glue soften with high humidity? Enough for it to be a concern using it for the soundboard/rim joint? Is hot hide glue similarly affected by humidity? If so, then I would say there is little concern with liquid hide glue softening with high humidity.

Maybe I'm glad I used Titebond Extend on my last soundboard installation.....

Terry Farrell

----- Original Message -----  
> For your clarification and to try and help Stéphane sort this out:
> 
> Here is the exact quote from the good folks at Tite-Bond themselves. 
> Sounds to me like the folks at Tite Bond will not recommend liquid hide 
> glue for this application.
> 
>    "The Titebond Liquid Hide Glue is sensitive to humidity, even when
>    dried. At
>    the least, it can soften in the humidity you describe. If the substrates
>    part during that time, the bond will fail. If the substrates remain
>    together
>    during that time and the humidity lowers, the bond will remain. I
>    hope this
>    answers the question."
> 
> This answer was give in response to the following question, also an 
> exact quote
> 
>    "Some European technicians told me it would possibly fail in an
>    environment
>    which has more than 50 % relative humidity.
>    What do you think ?" ......
> 
>    "The piano might undergo a relative humidity level of 60 % here. 
>    Will the
>    liquid hide glue joint stand this ?  On the open portion of the
>    perimeter,
>    the only stress the joint will undergo is the dimensional change of the
>    board under relative humidity change."
>
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