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
| Chemical symbol: |
W |
| Atomic Radius: |
2.02Å |
| Atomic Volume, cm3/mol: |
9.53 |
| Covalent Radius: |
1.3Å |
| Crystal Structure: |
Body centered cube |
| Number of Electron (with no charge): |
74 |
| Atomic Number of Protons: |
74 |
| Number of Neutrons (most common/stable nuclide): |
110 |
| Ionic Radius: |
0.62Å |
| Cross Section: |
18.5 barns ± 0.5 |
V-Shaped Filaments
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.
| Cat. # |
Overall Length |
No. Strand |
V- Opening |
Qty |
| 73840 |
3" (76.2mm) |
Single |
¾" (19mm) |
10/pk |
| 73842 |
3" (76.2mm) |
Triple |
⅝" (16mm) |
10/pk |
| 73844 |
3½"(88.9mm) |
Triple |
¾" (19mm) |
10/pk |
Coiled Filaments
Single or 3-strand coiled tungsten filaments, 0.5 mm (0.002") diameter wires.