6.C.7.Materials for the fabrication of missile components in the systems specified in 1.A., 19.A.1. or 19.A.2, as follows:.

a. Tungsten and alloys in particulate form with a tungsten content of 97% by weight or more and a particle size of 50 x10⁻⁶ m (50 µm) or less;
b. Molybdenum and alloys in particulate form with a molybdenum content of 97% by weight or more and a particle size of 50 x10⁻⁶ m (50 µm) or less;
c. Tungsten materials in the solid form having all of the following:
1. Any of the following material compositions:
i. Tungsten and alloys containing 97% by weight or more of tungsten;
ii. Copper infiltrated tungsten containing 80% by weight or more of tungsten; or
iii. Silver infiltrated tungsten containing 80% by weight or more of tungsten; and
2. Able to be machined to any of the following products:
i. Cylinders having a diameter of 120 mm or greater and a length of 50 mm or greater;
ii. Tubes having an inner diameter of 65 mm or greater and a wall thickness of 25 mm or greater and a length of 50 mm or greater; or
iii. Blocks having a size of 120 mm x 120 mm x 50 mm or greater.