More recent tests have been able to conclusively prove that the substance has an even higher melting point of 3,958 °C exceeding those of tantalum carbide and tantalum hafnium carbide which were both previously estimated to be higher.
Newer tests demonstrate that the substance has a higher melting point of 3,958 °C than tantalum carbide and tantalum hafnium carbide, which were once believed to have higher values.