Burndy Penetrox A-13 consists of a non- petroleum base vehicle in which zinc parti- cles are suspended. Recommended for aluminum to aluminum, aluminum to copper applications and aluminum conduit threads. Compatible with insulating materials such as rubber, or polyethylene. UL Listed and recommended for all voltages. When stored in its original container in cool (under 100 degrees F) dry environment, Penetrox oxide inhibiting compound will remain workable and functional for 5 years from the date marked on the container provided it is mixed per instructions prior to use.