On Dec 16, 2008, at 2:52 PM, Chris Solliday wrote: > Alcohol and water depends on the amount of water, more is more > aggressive, but in any case my findings were that VS Profelt is more > aggressive in general as a sizing solution. There is a pretty obvious reason for this: VS Profelt has a very high ratio of water in its contents. I believe it is in excess of 75% water. It's pretty rare that we use an alcohol and water mix that is 1:3 alcohol to waterl. More common is the opposite, 3:1 alcohol to water. So if you want to compare, it would be a good idea to use a few mixes of alcohol and water to compare to VSP. Maybe 3:1, 2:1, 1:1, 1:2, and 1:3. Or just 3:1, 1:1 and 1:3. I think that would give a pretty fair comparison. (That is, the 3:1 water to alcohol would be a fairly even match, the others would be instructive as alternative strengths). About the notion concerning action centers, I don't think a high water ratio there would swell the felt to take up space, like in key bushings, for the simple reason that it is a system that requires a lot more compression and a tighter final fit. If you add a higher proportion of water, it causes more knitting of fibers, hence more "shrinkage," resulting in a looser fit. The "shrinkage" is actually felting, locking the fibers together more tightly. When you apply the stuff, the action centers seize up (applying more compression). When the water evaporates, the more compressed fibers leave space between them and the pin. It works for key bushings because there is lots of extra space to be filled in to start with, and you actually want a somewhat loose fit (compared to action centers). Regards, Fred Sturm University of New Mexico fssturm at unm.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut_ptg.org/attachments/20081216/1ba363ec/attachment.html>
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