Metals, metal powders and material as follows— a tungsten and tungsten alloys, other than those specified in Dual-Use code 1C117, in the form of uniform spherical or atomized particles of 500 μm (micrometre) diameter or less with a tungsten content of 97 % by weight or more; b molybdenum and molybdenum alloys, other than those specified in Dual-Use code 1C117, in the form of uniform spherical or atomized particles of 500 μm diameter or less with a molybdenum content of 97 % by weight or more; c tungsten materials in the solid form, other than those specified in Dual-Use code 1C226 having material compositions as follows— 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.