Epoxy vs Urethane for Bonding Aluminum

[swall]

Both of these adhesives can be used for bonding aluminum, from what I have found. Does polyurethane have any advantages in vibration dampening/sound deadening compared to epoxy? The application would be bonding (laminating) two panels of aluminum for an automotive dash panel.

 

[TomDOT]

While it depends on the exact chemistry used*, polyurethanes tend to be more elastic than epoxies and should have reduced vibration transmission.

*It's a bit like asking: Which has higher yield strength, aluminum or steel? Generally steel, but it depends on the alloy and heat treating.

 

[JohnnyB21]

polyurethane has great advantages, but it doesn't bond to everything unless you have maybe a primer. Epoxies have the tendency to crack from vibration. But it really depends on the environment.