Titanium Grades 1, 2, 3 and 4 are commercially pure (99% minimum titanium). Each grade has slight variations in chemical composition that affect mechanical properties and design capability. The corrosion resistance is similar across all four grades. Titanium is light weight, exceptionally corrosion resistant and often exceeds the corrosion resistance of stainless steels in most environments. Of the four commercially pure (C.P.) titanium grades, Grade 2 is the alloy of choice for most industrial applications that require good ductility and corrosion resistance.