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.
Those in possession of a stale-dated personal check may wish to contact the owner of the account to receive an updated check rather than try to process the stale one. Many checks from larger businesses and government agencies must be processed within 90 or 180 days, or they become void.