prov:value
| - It is particularly preferred to use a material having a coefficient of linear expansion between the metal tip and the stock and enjoying oxidation resistance even at temperatures above 1,000??? C., for example, Pt, Pd, In or Ru per se, an alloy such as Pt-Ir, Pt-Pd, Pt-Rh or Pt-Ru, or as a material other than noble metals, Ni-Cr-Fe alloy (Inconel), SUS310 (20Ni-35Cr) or the like.
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