Pretty sure if there were much difference in weight/strength between these two, it would show up in our building. However, just read an online article by a Freeflighter which claimed "Ambroid is 20% lighter than Duco." The method was to dry out equal _volumes_ of liquid cement from the tubes, then compare weights of resulting dried samples. Problem there is such doesn't account for viscosity differences. Someone should compare the strength of two _solid_ samples of equal weight. The stronger should be the winner for our purposes, since that means less glue per strength. Ok, I'll do it. I suppose tensile strength should be what's to be measured, for our purposes. Anyone have a good idea for a valid test, applying, say .5 gram of solid glue (redissolved) to some kind of joint? Don't think it should be with balsa, but something less porous.
FWIW, 1 oz Duco liquid right out of tube weighed 27.26 grams. Thoroughly dried, same sample weighed 5.54 gram. So, 20.3% solids. Will do the same for a tube of Ambroid, but I believe viscosity can change according to marketing forces.
No trouble, I can still use all the above glue on projects.
Mark B
Received on Sat Jun 23 2012 - 07:05:21 CEST
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