<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.6000.16481" name=GENERATOR></HEAD> <BODY> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2>CA (cyanoacrylate) glue is basically made of two products: ethyl cyanoacrylate and polymethylmethacrylate. Their ratios, in the final product, determine their degree of polymerization and also their viscosities. CA glues react to moisture ie. that's how it sets. The vapors of these 2 chemicals are extermely irritating to the airways. If you do not turn you head aways form the fumes as a reflex, most likely the glue has begun to polymerize and its "active" ingredients are depleted accordingly.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2>There are many "recipes" to super glues. The trick is to find the correct viscosity (for pinblocks: as thin as it comes which is about 2 centipoise - water is 1 cps). Also you have to make sure it hasn't been sitting on the shelf for months - fresher is better. Polymerisation is slowed by cooling but its viscosity will increase - so store in a fridge and warm to room temp before use.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2>You might think that dissolving the glue in a solvent (such as acetone) to reduce its viscosity and make it creep more is a solution - but beware that most solvents that are appropriate to dilute such a polar mixture are also very prone to absorb water - which promotes its curing (acetone might have as mush as 10 % water content).</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2>So I suggest to try to find a supplier which has a high turn around. To do this, you might want to note the lot number on the package and go back a few weeks later to see if it's still the same lot on the shelf. Also, buy as small containers as possible because as soon as you break open the spout, you will introduce moisture - tenfold more if you transfer it to a hypo-oiler - so use quickly.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2>To say to buy a specific brand, in my opinion, is misleading since it could be a great product if used fresh but could have been sitting on the distributor's shelf for 6 months or more.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2>That's all that I have to say about CA adhesives for now,</FONT></SPAN></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2>Thanks,</FONT></SPAN></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN class=843520400-04082007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN class=843520400-04082007> <DIV align=left><FONT face=Arial color=#0000ff size=4><EM>Marc Lanthier</EM></FONT></DIV> <DIV align=left><FONT face=Arial color=#ff0000 size=4>Piano Lanco</FONT></DIV> <DIV align=left><FONT face=Arial size=2>514-770-7438</FONT></DIV> <DIV align=left><FONT face=Arial size=2>1-877-PIANO10</FONT></DIV> <DIV align=left><FONT face=Arial color=#ff0000 size=2><A href="mailto:info@pianolanco.com">info@pianolanco.com</A></FONT></DIV> <DIV align=left><FONT face=Arial color=#ff0000 size=2><A href="http://www.pianolanco.com">www.pianolanco.com</A></FONT> </SPAN></DIV></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN class=843520400-04082007> </SPAN></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left> <HR tabIndex=-1> </DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT face=Tahoma size=2><B>From:</B> pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <B>On Behalf Of </B>Tom Sivak<BR><B>Sent:</B> August 2, 2007 9:25 PM<BR><B>To:</B> Pianotech List<BR><B>Subject:</B> Re: CA glue---all the same?<BR></FONT><BR></DIV> <DIV></DIV> <DIV>I didn't think it was a thickness problem.  It appears to the eye to be as watery as the ultra-thin stuff.  Maybe the difference between thin and ultra-thin is enough to make it work or not?</DIV> <DIV> </DIV> <DIV>But pinblock plugs?  On a 75 year old Starck spinet?  </DIV> <DIV> </DIV> <DIV>I guess my question might really be: are there different strengths of CA glue?  Different formulae?  Or is CA glue just CA glue, period?  (Thickness or thinness aside)<BR><BR>Tom<BR><BR><B><I>John Ross <jrpiano@win.eastlink.ca></I></B> wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <META content="MSHTML 6.00.6000.16481" name=GENERATOR> <STYLE></STYLE> <DIV><STRONG><FONT face=Arial>The Loctite might be thicker, therefore unable to travel.</FONT></STRONG></DIV> <DIV><STRONG><FONT face=Arial>A hobby shop usually has a fast turn over. so it should be fresh stuff. Be sure and get the ultra-thin stuff, and get the super fine tips they have that fit on the bottle, usually in packs of 5.</FONT></STRONG></DIV> <DIV><STRONG><FONT face=Arial>Wear a respirator if it bothers you, and get lots of ventilation in the area.</FONT></STRONG></DIV> <DIV><STRONG><FONT face=Arial>I have never had the c/a glue fail me.</FONT></STRONG></DIV> <DIV><STRONG><FONT face=Arial>The only place I can see where it wouldn't work, would be on a split, or separated pinblock.</FONT></STRONG></DIV> <DIV><STRONG><FONT face=Arial>In that case, if it were only a few, I would try pinblock plugs. They are available from Webb Phillips, in two sizes.</FONT></STRONG></DIV> <DIV>John M. Ross<BR>Windsor, Nova Scotia, Canada<BR><A href="mailto:jrpiano@win.eastlink.ca">jrpiano@win.eastlink.ca</A></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=tvaktvak@sbcglobal.net href="mailto:tvaktvak@sbcglobal.net">Tom Sivak</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, August 02, 2007 9:02 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> CA glue---all the same?</DIV> <DIV><BR></DIV> <DIV>List</DIV> <DIV> </DIV> <DIV>Is there any difference in the quality of various brands of CA glue?   </DIV> <DIV> </DIV> <DIV>I have been using Lock-Tite Super Glue, and whereas it seems to work fine for various repairs, I have had a couple of pinblock treatments that didn't take.  I used A LOT of it, too.  It seems as thin a viscosity as the glue available from Schaff or the local hobby shop, so I don't think that is the problem.  I've been buying it because it's available at the hardware store down the street, and I like that it comes in such small bottles.  </DIV> <DIV> </DIV> <DIV>But I've noticed that my eyes don't water when I use it.  Today I bought a different brand of CA from the hobby shop, and man! I had to leave the area for awhile, it was so gaseously toxic!</DIV> <DIV> </DIV> <DIV>I had initially thought that the last two pinblocks were just too far gone and that the glue couldn't make an impact.  Now, I'm starting to think that the Lock-Tite glue might be weaker.</DIV> <DIV> </DIV> <DIV>Any thoughts?  <BR><BR>Thanks,</DIV> <DIV>Tom Sivak</DIV> <DIV>Chicago</DIV></BLOCKQUOTE></BLOCKQUOTE><BR></BODY></HTML>