the chemical itself does not appear to expire. However, it's understandable why you might believe it does; propane tanks are stamped with requalification dates to be retested, but this is to ...

Your propane tank's expiration date is stamped on collar. If you have an empty 20-gallon propane tank that's past its expiration date or that you believe is damaged, you should recycle it.

HILLSBORO — State investigators have revealed the cause of an explosion that killed three people at an auto repair shop in ...

The tank was last re-certified in 1978 and had a defective safety valve that allowed gas to escape, which was ignited by the open flame of a ceiling-mounted furnace.