Teflon is a remarkable substance. It has the best resistance to chemical attack of any polymer, and it can be used at any temperature between -73 C and 260 C with no effect on its properties. It also has a very low coefficient of friction.
A stale dated warrant is an unredeemed warrant which was issued more than six months prior to the current date. A stale dated warrant is expired and the original instrument is no longer negotiable.
There are two Bank of America warrants. The A warrants had an original strike price of $13.30 with an exercise date of January 16, 2019. The B warrants have a strike price of $30.79 and expire October 28, 2018. These and other TARP warrants provided unusual protections.