The ten chemical elements with the highest melting points at standard pressure — from tungsten and rhenium to technetium and ruthenium.
Quick answer: 1. Tungsten (W), 2. Rhenium (Re), 3. Osmium (Os), 4. Tantalum (Ta), 5. Molybdenum (Mo), 6. Niobium (Nb), 7. Iridium (Ir), 8. Ruthenium (Ru), 9. Hafnium (Hf), 10. Technetium (Tc).
Melting point is one of the most practically important properties of the elements, determining which materials can withstand extreme heat in jet engines, rocket nozzles, nuclear reactors, and high-performance electronics. The top of the list is dominated by refractory metals — elements that remain solid at temperatures above 2,000 °C. This ranking uses melting points at standard atmospheric pressure for each element's most common allotrope. Carbon (which sublimes at around 3,550 °C without melting at standard pressure) is excluded since it does not have a true melting point under 1 atm. All ten elements on this list are metals.
Tungsten has the highest melting point of any element at 3,422 °C. This refractory metal is essential for incandescent light-bulb filaments, arc-welding electrodes, rocket nozzles, and radiation shielding — any application where extreme heat resistance is critical.
Rhenium melts at 3,186 °C, the second-highest of any element. It is one of the rarest elements in Earth's crust, yet it is a critical component in nickel-based superalloys for jet-engine turbine blades because it retains mechanical strength at temperatures that would soften most metals.
Osmium melts at 3,033 °C, third-highest among all elements. Known as the densest element, osmium is also remarkably heat-resistant. Its hardness and resistance to wear make it valuable in electrical contacts and instrument pivots despite its brittleness and high cost.
Tantalum has a melting point of 3,017 °C and is one of the most corrosion-resistant metals. It is used in capacitors, chemical-processing equipment, surgical implants, and vacuum furnace components. Its combination of high melting point and ductility is rare among refractory metals.
Molybdenum melts at 2,623 °C. It is the most widely used refractory metal outside of tungsten, valued for its high strength at elevated temperatures, low thermal expansion, and resistance to corrosion in molten glass and certain liquid metals.
Niobium melts at 2,477 °C and is a key alloying element in high-strength low-alloy (HSLA) steels used in pipelines, automotive frames, and structural components. Its superconducting properties also make it essential for MRI magnets and particle accelerators.
Iridium melts at 2,446 °C and is the most corrosion-resistant metal known. It is a member of the platinum group and is used in crucibles for high-temperature crystal growth, spark plugs, and deep-sea electrical connectors.
Ruthenium melts at 2,334 °C and is the least expensive platinum-group metal. It is used primarily in hard disk drives, thick-film resistors, and as a catalyst in the production of ammonia and acetic acid.
Hafnium melts at 2,233 °C and is nearly identical to zirconium in its chemical properties. It is used in nuclear reactor control rods (because of its high neutron absorption cross-section) and in high-temperature alloys for aerospace applications.
Technetium melts at 2,157 °C and is the lightest synthetic element. It has no stable isotopes and is produced in nuclear reactors. Its melting point is remarkably high given its position in the periodic table, and it is used in small quantities as a corrosion inhibitor and in medical imaging.
| # | Name | symbol | atomic_number | boiling_point_C | group | period | density_g_cm3 |
|---|---|---|---|---|---|---|---|
| 1 | Tungsten (W) | W | 74 | 5555 | Transition metal (group 6) | 6 | 19.25 |
| 2 | Rhenium (Re) | Re | 75 | 5596 | Transition metal (group 7) | 6 | 21.02 |
| 3 | Osmium (Os) | Os | 76 | 5012 | Platinum group (group 8) | 6 | 22.59 |
| 4 | Tantalum (Ta) | Ta | 73 | 5458 | Transition metal (group 5) | 6 | 16.69 |
| 5 | Molybdenum (Mo) | Mo | 42 | 4639 | Transition metal (group 6) | 5 | 10.28 |
| 6 | Niobium (Nb) | Nb | 41 | 4744 | Transition metal (group 5) | 5 | 8.57 |
| 7 | Iridium (Ir) | Ir | 77 | 4130 | Platinum group (group 9) | 6 | 22.56 |
| 8 | Ruthenium (Ru) | Ru | 44 | 4150 | Platinum group (group 8) | 5 | 12.37 |
| 9 | Hafnium (Hf) | Hf | 72 | 4603 | Transition metal (group 4) | 6 | 13.31 |
| 10 | Technetium (Tc) | Tc | 43 | 4265 | Transition metal (group 7) | 5 | 11.5 |
Elements are ranked by melting point in degrees Celsius at standard atmospheric pressure (1 atm), highest first (rank 1 = highest melting point). Each element uses its most stable allotrope or the form most commonly referenced in standard tables. Values come from the CRC Handbook of Chemistry and Physics (105th Edition) and NIST Standard Reference Database 69. Carbon is excluded because it sublimes at standard pressure rather than melting; its triple-point melting temperature (about 3,550 °C) requires pressures above 100 atm. The order is fully reproducible from the melting-point column alone.
Carbon in its diamond allotrope does not melt at standard atmospheric pressure — it sublimes directly to gas at about 3,550 °C. To melt diamond, you need pressures above about 100 atm, at which point its triple-point melting temperature is around 3,550 °C. If pressurized melting were counted, carbon would rank above tungsten. This list uses melting points at 1 atm, so carbon is excluded.
Period 6 elements (tungsten through osmium) have highly stable electron configurations with strong metallic bonding. The 5d orbitals in period 6 are more diffuse than 4d in period 5, but relativistic effects contract them, creating unusually strong interatomic bonds. This is why tungsten, rhenium, osmium, and tantalum — all period 6 — occupy the top four spots.
Tungsten's 3,422 °C melting point is the practical ceiling for any pure metal. For ultra-high-temperature applications, engineers use tungsten alloys, tungsten-rhenium composites, or carbon-carbon composites (non-metallic) that can withstand temperatures above 2,000 °C without melting. The tungsten filament in a light bulb operates at about 2,500 °C — well below its melting point.