<!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 5.50.4616.200" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Terry, the specs for max service temp = for epoxy vary from 150-400 degrees F on a typical brochure I have from = Hysol.  I've never heard that high temps at curing (under the max working temp) = would weaken the result, but I may be wrong.  Most mfg. give a = recommendation, but I think they say room temp cure merely to say that it will indeed = cure without heat.  Some won't.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I recall years ago I worked for a = company that made voice coils for computer disc drives for IBM.  The adhesive used to = coat the windings was a structural adhesive made by MMM.  The cure = schedule specified by IBM was 1 hour at 130 F followed by 1 hour at 250 C = followed by 1 hour at 350 C.  (that's 842 F).  The normally green epoxy = turned brown.  I gleefully informed the IBM engineers that the heat was in = excess of the operating temperature specified by MMM.  After much gnashing = of teeth, fancy footwork and backtracking IBM changed its specs, = and</FONT></DIV> <DIV><FONT face=Arial size=2>we found it's not too hard to be green.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2><A href="http://www.epotec.com">http://www.epotec.com</A>   is = the website.  Epotec301 has a  Shore D hardness of 81</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>I've just learned that clear coat has a = viscosity</FONT> <FONT face=Arial size=2>of approx. 600 for the = resin and about 200 for the hardener.  I'm not sure how the mix relates = but it should be about 500 since the mix ratio is 2-1.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Happy gluing.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Carl Meyer  Assoc. PTG<BR>Santa = Clara, California<BR><A href="mailto:cmpiano@attbi.com">cmpiano@attbi.com</A> = </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=mfarrel2@tampabay.rr.com href="mailto:mfarrel2@tampabay.rr.com">Farrell</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, January 06, 2002 = 8:03 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Epoxy</DIV> <DIV><BR></DIV> <DIV>Hi Carl. My info is that elevated curing temperatures can tend to = weaken the cured epoxy. It would concern me to heat bridge pins. It may not = be a valid concern as I'm sure the heat is dissipated rather quickly. I = have always found West System to be thin enough to wick into all birdseye cracks = around bridge pins - when the pin are removed. I'm sure it would be nice to = have an even thinner epoxy - although, I wonder if it would be as convenient = to apply - the thicker West System holds a nice drop on a wire or on the bridge = pin base for application! What is the strength characteristics of the = Epotec301? Is it as strong/hard as West System resin? Do you have a web site for Epotec301?</DIV> <DIV> </DIV> <DIV>Oh, and BTW: Just sent out an old Fisher upright with a = completely rebuilt action and a VERY nicely leveled set of keys!</DIV> <DIV> </DIV> <DIV>Terry Farrell <SPAN = id=__#Ath#SignaturePos__></SPAN> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=cmpiano@attbi.com href="mailto:cmpiano@attbi.com">Carl = Meyer</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, January 05, = 2002 7:44 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Epoxy</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>NSIP</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Epotec301 is expensive since it = is optical grade.  I'm waiting for a spec sheet for clear coat, but I = think it is similar to liquid wood.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>There may be other qualities of = epoxy that will enhance penetration, but I would think viscosity would be the = primary one.</FONT></DIV> <DIV><FONT face=Arial size=2>Warming the pinblock, bridge or = other items helps a great deal.  A lot of spec sheets don't list viscosity, = hardness and other parameters and there is no easy way to = compare.  </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Still learning all I can about epoxy!!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Regards</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Carl Meyer  Assoc. = PTG<BR>Santa Clara, California<BR><A = href="mailto:cmpiano@attbi.com">cmpiano@attbi.com</A> </FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>