<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2900.3243" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT face=Arial>I stand corrected. I just received a response from Franklin technical:</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial><EM>"<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT size=3>The Titebond Liquid Hide Glue will soften with high humidity, often above 60%. Most pianos don’t see that extreme, even in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:City w:st="on"><st1:place w:st="on">Tampa</st1:place></st1:City>, where humidity is high."</FONT></SPAN></EM></FONT></DIV> <DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT size=3>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.</FONT></SPAN></DIV> <DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT size=3>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.</FONT></SPAN></DIV> <DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT size=3>Maybe I'm glad I used Titebond Extend on my last soundboard installation.....</FONT></SPAN></DIV> <DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT face=Arial></FONT></SPAN> </DIV> <DIV><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT size=3>Terry Farrell</FONT></SPAN></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>----- Original Message -----  <BR>> For your clarification and to try and help Stéphane sort this out:<BR>> <BR>> Here is the exact quote from the good folks at Tite-Bond themselves. <BR>> Sounds to me like the folks at Tite Bond will not recommend liquid hide <BR>> glue for this application.<BR>> <BR>>    "The Titebond Liquid Hide Glue is sensitive to humidity, even when<BR>>    dried. At<BR>>    the least, it can soften in the humidity you describe. If the substrates<BR>>    part during that time, the bond will fail. If the substrates remain<BR>>    together<BR>>    during that time and the humidity lowers, the bond will remain. I<BR>>    hope this<BR>>    answers the question."<BR>> <BR>> This answer was give in response to the following question, also an <BR>> exact quote<BR>> <BR>>    "Some European technicians told me it would possibly fail in an<BR>>    environment<BR>>    which has more than 50 % relative humidity.<BR>>    What do you think ?" ......<BR>> <BR>>    "The piano might undergo a relative humidity level of 60 % here. <BR>>    Will the<BR>>    liquid hide glue joint stand this ?  On the open portion of the<BR>>    perimeter,<BR>>    the only stress the joint will undergo is the dimensional change of the<BR>>    board under relative humidity change."<BR>></FONT></DIV></BODY></HTML>