1.1 This specification covers five grades of zirconium strip, sheet, and plate. 1.2 Unless a single unit is used, for example corrosion mass gain in mg/dm2, the values stated in either This specification covers five grades of zirconium strip, sheet, and plate. These are low oxygen zirconium (Grade R60700), unalloyed zirconium (Grade R60702), zirconium-tin (Grade R60704), zirconium-niobium (Grade R60705), and zirconium-niobium (Grade