The melting point of tungsten in a vacuum is 3420ºC (6187ºF). Tungsten has the highest melting point of all metals in pure form. It also has the lowest vapor pressure at temperatures above 1650ºC (3000ºF) and the lowest coefficient of thermal expansion of any pure metal. These properties make tungsten an ideal material for applications that require structural integrity at elevated temperatures, such as vacuum furnaces. Tungsten is commonly used in the construction of hot zones in vacuum furnaces, where temperatures can reach up to 3000ºC (5432ºF) in the tungsten hot zone and 2200ºC (3992ºF) in the graphite hot zone. Vacuum furnaces operate at low pressures and are used for processes such as annealing, brazing, sintering, and heat treatment. Tungsten's high melting point and other desirable properties make it suitable for these high-temperature applications in a vacuum environment.
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