Modpack version
Enigmatica 2 Expert v1.83

Issue
There are a few inconsistencies when it comes to armor and weapons dropped by mobs:

• All Twilight Forest armor sets can be deconstructed into ingots via a crafting table when fully repaired. This seems odd in the scope of the pack especially after arc-furnace recipes were added for the sets
• Flux-Infused armor from Redstone Arsenal do not have an arc-furnace recipes even though the tools from the mod do.
• Psimetal tools and armor do not have a deconstruction recipe, in either the arc-furnace or crafting table - noa12390

Thank you for the report, I will investigate the issue.

same applies to psi armor

To clarify, Psimetal armor and tools do not have an arc-furnace recipe to deconstruct them them into ingots.

Seems overlooked considering to make the armor set you need manasteel armor, which can be deconstructed in the arc-furnace.
As psimetal armor isn't a straight upgrade from manasteel – that is it requires more than just psimetal ingots to craft – I'm not convinced it should be deconstructable. It's similar to the nano or quantum suits.

TF armors can be recycled easier in an effort to limit the frustration some may feel with going through the Twilight Forest for armors.

Flux-Infused Armor is made out of Fluxed Armor Plating, whereas the tools are made of Fluxed Electrum Ingots, that's why one can be recycled and the other cannot. Making it possible to recycle them for Fluxed Armor Plating seems a bit silly, is it can only be used to make new armor.

I agree that it's inconsistents, but it's intentional for the most part :)

Thanks for the report.