Dan Forman
01-07-2007, 6:19 AM
Thought I ought to follow up on my humble experiments. To refresh, I tried three different samples of Titebond liquid hide glue, one out of date by twabout 3 years, another small bottle which didn't have a date on it ,but has beebn sitting around for a good while, and lastly a new bottle purchased last week, which is good for another 8 months.
All tests were done on the same pieces of oak, glued in different locations, cured for 24 hours, then placed in a vise, and one surface whacked with a hammer until they separated. The results showed that there is good reason for the expiration dates. The older glue failed completely at the glueline, no wood fibers were torn from either piece. The second sample, with no expiration date fared only somewhat better, mostly failed at the glueline, but a few fibers were torn from the mating piece. The fresh sample showed no glue failure at all, but the wood itself fractured across the whole joint.
This says nothing about how well the glue ages when applied within the expiration date, but it certainly holds well in the short term.
Dan
All tests were done on the same pieces of oak, glued in different locations, cured for 24 hours, then placed in a vise, and one surface whacked with a hammer until they separated. The results showed that there is good reason for the expiration dates. The older glue failed completely at the glueline, no wood fibers were torn from either piece. The second sample, with no expiration date fared only somewhat better, mostly failed at the glueline, but a few fibers were torn from the mating piece. The fresh sample showed no glue failure at all, but the wood itself fractured across the whole joint.
This says nothing about how well the glue ages when applied within the expiration date, but it certainly holds well in the short term.
Dan