In Avengers: Endgame, Hulk used
Tony’s Gauntlet to snap everyone back into existence.
A release of power of that magnitude
nearly destroyed the original Infinity Gauntlet, and that was made of enchanted Uru, the same stuff Thor’s hammer and axe are made of.
So how did this item survive, if it was made of a lesser material?
Disclaimer: I am currently in the process of trying to verify if the Stark Gauntlet was made out of Vibranium. So far the only theory I can think of for why it might be is that he could have re-purposed Vibranium from Ultron or someone could have taken some out of Wakanda in the time gap.
With that said I would take this answer with a pinch of salt.
The Infinity Gauntlet is made out of Uru, the same as Mjolnir, and Stark’s Gauntlet is made out of Vibranium, the same as Cap’s shield. We’ve seen these two metals come to blows with each other when Thor has hit Cap’s shield with Mjolnir over the years and it as much as dented it so who’s to say it is stronger? In fact Vibranium is the strongest metal on Earth.
Bruce Banner: I don't follow. What comes out of Wakanda? [looking at Steve's shield]
Tony Stark: The strongest metal on Earth.
Avengers: Age of Ultron
Add onto that, that the enchanted Uru is essentially just advanced science that people don’t understand and so call magic.
Thor: Look your ancestors called it magic. You call it science. I come from a place where they're one and the same thing.
Thor
Lastly, note those who made the Stark Gauntlet: Tony, Banner and Rocket. Tony and Banner have had exposure studying Infinity Stones in the past and Rocket is an extremely skilled engineer. There’s also the possibility that they took the original Infinity Gauntlet from Thanos at the beginning of the film and so have improved upon the original design.
This is, of course, mostly speculation. But I think that it's reasonable speculation, regardless of whether or not it is accurate.
Part of the Infinity Gauntlet's function was to protect the user from the full force of the Stones.
When
The Hulk used Tony's Gauntlet,
It left him in significantly worse shape than than Thanos was at the end of Infinity War. Obviously, it's possible that the difference was due to Thanos's inherent robustness, but it's also possible that the original Gauntlet was more protective than the new one. And just like a strong resister generates more heat than a weak one, I'd expect that the more a Gauntlet protects its user, the more damage the Gauntlet itself would take.
It's also possible that
Reversing Thanos's Snap
was less dangerous than the Snap itself. Certainly Thanos took a great deal more damage when he
destroyed the Stones
than when he Snapped, indicating that either different effects have different degrees of backlash, or that the damaged Gauntlet was less protective than the fully functioning one.
