Sulfuric anodizing is commonly referred to as type II anodizing. Using an electrolytic solution of sulfuric acid at room temperature and a current density of 15 to 22 Amps per square foot forms it. The process can run for 30 to 60 minutes depending on the alloy used. This produces a generally clear coating, depending on sealing, and a minimum of 8µm thick. One third of the coating thickness can build up per surface and 2/3 will be penetration. Sulfuric anodize is the most widely used type of anodize and has many desirable benefits.