YES I DO!!!
(OK... OK... OK... I know... you do not want a WEAKNESS there to come between you and the fish...)
What we know as "flourocarbon" line/leader/tippet is probably actually made from polytetrafluoroethylene resins or PTFE or similar resins. There are actually eight (8) different polymers that can be called "flourocarbon." I suspect that whichever one is used, it is mixed with "fillers" of some kind.
(The word "Fourocarbon" covers a big family of "stuff" including plastics, refrigerants, propellants in aresol cans, solvents, and even anesthetics. That's right... the stuff they put you to sleep with at the hospital.)
PTFE is better known as "Teflon"... yep... that stuff at the bottom of your frying pan that makes it "non-stick"... You can also compare it to GoreTex, Scotchguard, and a few other known products. As I understand it, it is also one of the coatings used on fly lines.
IF the leader material is a PTFE, then there is a very high resistance to chemicals and a high tolerance to heat and cold - 40 below to about 480 deg F. It is also highly resistant to radiation. Its "cousin" PVF could be the polymer used to make leaders, but it has much the same properties.
I'm not sure what caused the breaks you experienced, but the material is not to blame. There could be some manufacturing defects (voids, bad filler, or other defects) that cause a particular spool, leader, or batch to be "bad" but don't rule out flouro leaders and tippets because of one or two problems.