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I'm very surprised to see the Polyurethane construction adhesive perform so well. I noticed it blobbed over both ends. I wonder if the entire blob was helping
by aeonik 2y ago
I'm very surprised to see the Polyurethane construction adhesive perform so well.
I noticed it blobbed over both ends. I wonder if the entire blob was helping redirect the load from tension into compression onto the ends. And/or it did a better job resisting the bending moment induced by his asymmetric setup.
I'm also not convinced that the other adhesives compromised the PETG. PETG, while not as resistant as Polypropylene, High density Polyethylenes, or Fluorinated plastics, it's still pretty darned resistant.
At the temperature he was testing at I would expect PETG to survive most acids, bases, and other solvents for days.
Maybe some of the glues were too rigid and robbed the PETG of its strength by preventing flexing?
MMA being at the top makes sense as it's a true chemical weld at that point.
- DannyBee 2y agoAgree on all points - MMA being the winner is obvious. One thing to keep in mind is that a lot of these PETG filaments are not true PETG's. I didn't get a chance to watch with sound on, but curious if he verified it was really PETG A lot of the PETG's are really PLA/PETG mixes. Or event mostly PLA with some small PETG. Or something else entirely. I actually have had filament claim to be 100% PETG, but it dissolved almost instantly in acetone, so not sure what it was, since even PLA doesn't really do that. Often you can also tell it's not really PETG by the claimed glass transition temperature/etc, but ....