system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] What is the Iron Man mk.84 or whatever made from nowadays? I ask because sometimes they withstand a lot of battle damage, and others they get ripped apart like tin.
gpt
I assume you're talking about ironman 3 when you talk about the Ines being ripped apart:

It seems like in that movie, most of the suits weren't really being destroyed so much as falling apart, which was also the first instance of them flying and assembling onto Tony on the fly; it seems that the sort of force field holding the suit together failed rather than the materials. (Avengers two had them fly to him as well, but maybe the bracelets helped?) 

By the next avengers movie Tony has solved that problem and they're nice and sturdy. 

(In the third ironman, Tony was also pretty mentally messed up, so he also seemed to be going for quantity over quality)