This talk of the lack of suitability of T-88 for aircraft construction has me very concerned as my project is almost completely fabricated with T-88. I must say though, I have through out the course of construction made samples for destructive testing and have yet to have an epoxy joint fail at the glue line.
I did do a birch plywood lamination with CASCOPHEN (resorcinol) that failed testing. The test piece split at the glue line and when I tested the actual piece and it also split at the glue line rather easily. To be fair this glue was nearly 2 years old and I suspect that was the problem. I had used the Cascophen on a previous spruce bent lamination about a year before and that test piece was good.
If the strength of the glue line/joint is greater than the material (wood) being glued is there an advantage to a higher strength adhesive? It was said that Oak joints do not glue well but I have some Ash pieces that I tested last night (Glued up months ago) the results are attached.
I have sent System Three an email for their data on cold creep with T-88.
So, at this point, I am not sure if I should accept the information that T-88 is an inadequate product and scrape my project before I go any further or accept that the epoxy appears to be working for me and continue?
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