National Oxygen Ltd is an India-based company engaged in manufacturing industrial gases, such as Oxygen and Nitrogen. It is a supplier of industrial gases both in liquid and gaseous forms. The company's products include Industrial liquid oxygen, Industrial gaseous oxygen, Industrial liquid nitrogen and Dissolved acetylene gas. The product's applications involve blast furnace, copper smelting, manufacture of explosives, heart stimulation, cryogenic preservation and cutting and welding. The group derives key revenue from India.