Example :
Cimmerian Steel pauldron (Garrison Armorer’s Bench) :
12 Hardened Leather
12 hard steel
1 Perfected Heavy Padding
Perfected Heavy Padding (Garrison Armorer’s Bench) :
21 Hardened Leather
7 Elephant Hide
3 Twine
Dismantle :
3 hard steel (cost 12)
3 Hardened Leather (cost 33)
Why to build a Dismantle bench?
It should return at least 50% of the total cost!
When it was first introduced it would give more materials back. funcom nerfed it pretty soon after 
Had not actually checked but it seemed not working as before Damn the Nerfs.
I agree, the dismantling bench should give back at least half the cost of creating the item.
I would further suggest that more things should be added to what can be dismantled.
eg. legendary items and any recipe or paper item, etc.
The problem is that’s relatively easy to farm high end gear.
If dismantling gave half of the material cost back i’d never gather materials for hardened leather again, i’d just farm Mounds of the Dead and dunk whatever armour pieces i’d get into the bench.
It would be much, much faster.
I don’t farm steel now, it’s easier to farm the Mounds and New Asagarth for steel.
You don’t need to sell me on the idea, I’m already a fan. 
I keep our dismantling bench under a stairs away from every thing else accidentally thrown some good gear in way back.
If you have building pieces, or placeables like benches, don’t put them in the dismantling bench, you’ll get back more materials by dismantling them manually.
imo the d-bench should give back the same materials if not more, as a manual dismantle.
pretty sure this was a nerf on Cimmerian in specific (would be interesting to see how it hit other armor types I must admit im not in the habit of dismantling produced armor) as people were just doing the mounds instead of crafting hardened leather as you would get tons of hardened leather.