Tungsten heavy metal has the highest melting point (3410°C or 6170°F) of all metals.? The extremely high melting point of pure tungsten makes all the common manufacturing techniques used for metals such as iron impractical. Specialized methods make possible the processing of pure tungsten into rod, sheet, and wire for a wide variety of high temperature applications including incandescent lamp wire, TIG welding electrodes, high temperature heat shielding, etc.

As tungsten heavy metal is the raw material of making tungsten heavy metal crucible, so tungsten heavy metal has properties of high density, high strength, low electrical resistivity, low thermal expansion and erosion resistance, etc.

Since the melting point of tungsten heavy metal has reached 3410℃, tungsten heavy metal crucible is widely applied in furnace industry such as sapphire growth furnace, quartz glass melting furnace, and rare earth smelting furnace。The temperature in working environment of tungsten heavy metal crucible is above 2000℃。 For sapphire crystal growth furnace, high-purity, high- density, no internal -crack tungsten crucible with other features of exact measurement and smooth surface has decisive influence on success ratio of seed growth, quality control of pulling crystal, metamictization pot-committed and service life during sapphire growth process.