CA glue---all the same?

[Gregor _]

thank you for the detailed information. But what is a hypo-oiler?

Gregor


>From: "Marc Lanthier (Piano Lanco)" <info at pianolanco.com>
>Reply-To: Pianotech List <pianotech at ptg.org>
>To: "'Pianotech List'" <pianotech at ptg.org>
>Subject: RE: CA glue---all the same?
>Date: Fri, 3 Aug 2007 20:55:47 -0400
>
>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.
>
>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.
>
>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).
>
>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.
>
>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.
>
>That's all that I have to say about CA adhesives for now,
>
>
>Thanks,
>
>Marc Lanthier
>Piano Lanco
>514-770-7438
>1-877-PIANO10
>info at pianolanco.com
>www.pianolanco.com
>
>   _____
>
>From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On 
>Behalf
>Of Tom Sivak
>Sent: August 2, 2007 9:25 PM
>To: Pianotech List
>Subject: Re: CA glue---all the same?
>
>
>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?
>
>But pinblock plugs?  On a 75 year old Starck spinet?
>
>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)
>
>Tom
>
>John Ross <jrpiano at win.eastlink.ca> wrote:
>
>The Loctite might be thicker, therefore unable to travel.
>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.
>Wear a respirator if it bothers you, and get lots of ventilation in the
>area.
>I have never had the c/a glue fail me.
>The only place I can see where it wouldn't work, would be on a split, or
>separated pinblock.
>In that case, if it were only a few, I would try pinblock plugs. They are
>available from Webb Phillips, in two sizes.
>John M. Ross
>Windsor, Nova Scotia, Canada
>jrpiano at win.eastlink.ca
>
>----- Original Message -----
>From: Tom  <mailto:tvaktvak at sbcglobal.net> Sivak
>To: pianotech <mailto:pianotech at ptg.org>
>Sent: Thursday, August 02, 2007 9:02 PM
>Subject: CA glue---all the same?
>
>List
>
>Is there any difference in the quality of various brands of CA glue?
>
>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.
>
>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!
>
>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.
>
>Any thoughts?
>
>Thanks,
>Tom Sivak
>Chicago
>
>

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