Hi Gregor. Hypodermic needle = hypo Just a nickname for thin or small. My needle is .036" outside diameter. That would be about 2/3 the size of a size 20 center pin. Joe Goss RPT Mother Goose Tools imatunr at srvinet.com www.mothergoosetools.com ----- Original Message ----- From: "Gregor _" <karlkaputt at hotmail.com> To: <pianotech at ptg.org> Sent: Saturday, August 04, 2007 4:24 AM Subject: RE: CA glue---all the same? > 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 > > > > > > _________________________________________________________________ > Express yourself instantly with MSN Messenger! Download today it's FREE! > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ >
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