REFRACTORY METALS   

  TYPICAL APPLICATIONS
Tungsten: Filaments, heaters and grids for the lamp and electronics industry.
 
Rhenium Tungsten: 3% Rhenium added for applications where resistance to recrystallisation, elongation and pliability are needed after heating.
 
Molybdenum: Mandrels or supports for winding lamp and electron tube coils, TWT helixes, furnace windings, tube grids, etc.
 
Molybdenum Rhenium: 50% Molybdenum, 50% Rhenium, used for grids, heaters, supports etc, where high electrical resistivity and low thermal conductivity, weldability and ductility are of importance.
 
Rhenium: Used for filaments in mass spectrometry and ion gauges where electrical resistivity, electron emission, weldability and ductility are required.
 
Tantalum: Used in heat exchangers, electron tube capacitors, filaments, grid wires and getters.          
  PHYSICAL PROPERTIES                                                                                                                                                                         
    Ir Mo Pd Pt Re Ta Ti W Zr
   Density g/cc 22.42 10.2 12.02 21.45 21.02 16.6 4.54 19.3 6.53
   Melting point ºC 2410 2610 1552 1769 3130 2996 1668 3410 1852
   Boiling point ºC 5300 5560 3980 4530 5900 6100 3260 5900 3580
   Exp coeff  x10-6 per ºC 6.8 5.4 11.0 9.0 6.6 6.5 8.9 4.6 6.9
   Thermal conductivity W/m/ºC 147 138 72 72 48 58 22 173 22
   Yeild strength MN/m² @ 20ºC - 690 80 65 350 240 170 1380 290
   Tensile strength            min 550 690 140 125 1125 240 230 690 400
   MN/m² @ 20ºC             max 1200 1380 325 300 2225 480 460 3450 550

        Note : These are the properties of the raw material, values may vary after processing.