Properties: symbol: W, silvery white, shiny metal, density: 19.35 grams per
cubic centimeter, melting point: 3410-20 ℃, boiling point: 5927 ℃, mohs
hardness: 7.5, the chemistry of the tungsten weights is stable, with air and water at
room temperature without response, not soluble in hydrochloric acid, sulfuric
acid, nitric acid and alkali solution. Dissolved in aqua regia, and a mixture of
nitric acid and hydrofluoric acid. Under high temperature to chlorine, bromine,
iodine, carbon, nitrogen, sulfur and other chemical combination, but not with
hydrogen.
USES: mainly made of tungsten powder and tungsten carbide powder and
tungsten compounds, widely used in chemical industry, machinery, electronics and
other fields, make filament and high speed cutting steel alloy, also used in
optical instruments.
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