Tungsten has the highest melting point and lowest vapor pressure of all metals, and at the temperatures over 1650°C has the highest tensile strength. It has excellent corrosion resistance and is attacked only slightly by most mineral acids.
Tungsten is the most useful material used in vacuum evaporation technique, due to its special properties and cost factor.
Properties of Tungsten
|Atomic Volume, cm3/mol:
||Body centered cube
|Number of Electron (with no charge):
|Atomic Number of Protons:
|Number of Neutrons (most common/stable nuclide):
||18.5 barns ± 0.5
High purity, vacuum grade tungsten wire 0.02" (0.50mm) diameter, V-shaped filaments ½" (12.7mm) deep, with a bottom angle of 45°, either single wire or triple strand.