Lead sub oxide is also known as grey oxide because of its appearance. It is manufactured industrially from lead metal by oxidising it in the Ball Mill process. The molecular formula for lead sub-oxide is Pb.PbO Uses Lead sub-oxide is used in: Battery plates of lead-acid batteries, Liners of sulphuric acid tanks, Anode of electrolytic cell.Lead sub-oxide is available in 25 kg HDPE bags.