The melting point of Tantalum is 2980℃ , which is the third most refractory metal after Tungsten and Bismuth. The pure Tantalum has a blue color and is extremely plastic. It can be rolled into a very thin (less than 0.01 mm) plate without annealing in the cold state.Although the melting point and boiling point of tantalum are high, the work of electron escape is lower than that of refractory metals such as tungsten and molybdenum. Because of its weak ability to emit electrons, tantalum has been applied in electric vacuum technology.

The corrosion resistance of tantalum is the same as that of glass. Only fluorine, hydrofluoric acid, sulfur trioxide (including fuming sulfuric acid), strong alkali and some molten salts affect tantalum at medium temperature (about 150 ℃). Tantalum is stable in air at room temperature and is heated above 500 ℃ to accelerate oxidation to form Ta205.. Tantalum is an important industrial product.