1.1 This specification covers hot- or cold-worked hafnium rod and wire, or both.1.2 This specification contains two material grades, one specifically for nuclear applications (Grade R1) and one for commercial applications for alloying (Grade R3) This specification covers hot-, cold-, or both hot- and cold-rolled hafnium rods and wires in either one of two grades. All grades should be in the recrystallization annealed condition unless specified otherwise. The materials should be made from ingot