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Pure Tungsten - Wolfram
Tungsten applications are relatively recent, and have only been of great importance since the 1950's. Pure metallic tungsten has its uses that mainly exploit its very high melting point.
Since the tungsten thermal expansion coefficient is very close to that of glass and silicon boron, tungsten is used for glass-metal seam joints due to its high ability to shield radiation (10 times higher than lead and much less polluting) and is used in applications where good absorption capacity connected to reduced sizes is required.
For a long time, tungsten has also been used in costume jewellery and jewellery manufacture, because of its hypo-allergenicity and its ability, due to its extreme hardness, to remain polished much longer than any other metal.
Purity: 99.95% min.
Density: 10.2g / cm³-19.2g / cm³