I'm pretty sure the O-rings aren't plastic. That's probably something you'd use on a circuit board or some other electrical application.
I probably wouldn't use it for gears either. Stick to the "tried and true".
That being said there's nothing preventing you from getting a comparable O-ring from a hardware store and testing your stuff on that.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE