The Harima smelter in Japan uses the Imperial Smelting Process (ISP) to make zinc. A process where the Imperial smelting Furnace (ISF) is the key unit operation simultaneously producing lead and zinc. Harima is one of 2 ISP plants in Japan. The current capacity is 97kt/a slab zinc and there are currently no plans to expand this. The smelter is however unique amongst the ISP plants because it treats solely secondary oxide feed materials.