The absolute toughest material you have cut through?

Seriously, I think the worst thing I ever had to cut through was the plastic clam shell packaging on a piece of high dollar consumer electronics. I swear the stuff would have stopped a bullet. In the end I have to make a hole with a heavy lockblade, and then cut it open with tin snips. :rolleyes:
 
Drywall, asbestos fireproofing, Rockwool insulation, and old carpet are all tough on knives, but nothing comes close to the difficulty of cutting through the mis-informed attitude of gutter-press-fed hysteria that suurounds anyone who carries a knife of any kind in the UK these days, whether that knife is of a size and design deemed to be EDC legal or not, and whatever the reasons are for carrying it.

Second toughest thing I guess I've cut was a 4" nail, straight through just behind the head. We were cutting water bottles lined up along an old 2x4 laid flat on a bench during a relatively informal cutting competition. I sliced the bottles cleanly, but then caught the end of the 2x4, taking off a big wedge-shaped piece of wood. Picking up the wood I saw a little silver dot in the middle of it... :( When I checked, the 2x4 had what was left of the bent-over nail in it and the head was in the piece I cut off. I didn't like what it did to the fine edge of my competition knife, but it soon honed back to proper sharpness.
 
Toughest, a tire, steel bands took a great mirror edge from sharp to dull real quickly, cutting tread is an exercise only a pure masochist would partake in.
 
A brick while I was landscaping my yard. I needed to cut one in half to fit and I had my Scrapper 6 on me, so I used that. It cut the brick just fine but there was a little chip missing out of the blade. Nothing that couldn't be sharpened out.
 
I've cut through some nails with my Scrapyard SOD. It put a bunch of dents in the edge, so I probably won't be doing that again any time soon.

My folders seem to handle sheet tin and aluminum just fine.
 
we were working on a landfill project. specs called for a 6 oz nonwoven polypropolene filter fabric in between the sand filter layer and the dirt/cover layer. the guys were trying to cut it with razor knives - they would get about 2' of cut before the blade would dull completely. I had a gerber multitool with a serrated blade - that lasted about 20'. we eventually ended up putting a carbide demo blade on our 14" stihl cutoff saw and more or less burned our way through it.
 
Bone, serpentine belts, carpet, fiberglass, every kind of wire imaginable... the last 3 pretty much dull any edge/steel so fast it's not even funny...
 
Woven fiberglass 'fireblanket' as they call it at work. For a few inches you can tell if you have a nice sharp edge. Then all of a sudden you don't!
 
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