Ultra-high-melting-point (3,422 °C) 99.95%+ pure tungsten crucibles, centerless-ground rods, rolled sheets, wire, and hot-zone elements for extreme vacuum thermal systems.
Boasting the highest melting point (3,422 °C) and lowest vapor pressure of all pure metals, tungsten is indispensable in vacuum/hydrogen/argon furnaces operating between 1,800 °C and 2,800 °C where molybdenum softens and graphite contaminates carbon-sensitive charges. Powder-metallurgy CIP-sintered and forged-machined tungsten crucibles contain molten sapphire (Al2O3 at 2,050+ °C), rare-earth metals, and refractory oxides without carbon vapor.
Available as thick-wall sintered/forged crucibles, spun thin-wall cups, centerless-ground rods, rolled stress-relieved foils and plates, twisted heating filaments, and lanthanated (WL10/WL20) machinable alloy forms.
| Property / Metric | Nominal Reference Value (Grade Dependent) |
|---|---|
| Tungsten Purity | ≥99.95% W (ASTM B760 / B777 class; 99.99% 4N on request) |
| Melting Point | 3,422 °C |
| Density | 18.2–18.8 g/cm³ (sintered crucible) / 19.1–19.25 g/cm³ (forged/wrought) |
| Thermal Expansion (CTE) | 4.5 × 10⁻⁶ /K (matches borosilicate/aluminosilicate glass seals) |
| Max Vacuum/Inert Service | 2,400–2,800 °C (oxidizes above ~400–500 °C in air) |
Reference values reflect typical sintered, fused, or wrought grades. Exact batch test figures are confirmed on your written quotation and accompanying lot Certificate of Analysis.
Specify product form (sintered machined crucible, spun cup, rod, foil/sheet, or custom hot-zone print), dimensions and tolerances, wrought forged vs. CIP-sintered density requirement, surface finish (black as-rolled vs. alkaline-cleaned/ground bright), and operating atmosphere.
Include target quantity, destination country/postal code for express air freight calculation, and any special cleanroom bagging or certification requests.
Prepare Pure Tungsten Crucibles, Rods, Sheets & Furnace Hardware RFQ ↗Complementary furnaceware, substrates, PVD consumables, and refractory hardware frequently ordered together.
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Submit your purity grade, geometry, quantity, and documentation requirements. Every order includes the producing mill's batch Certificate of Analysis (COA) and pre-shipment dimensional verification.