Tantalum powder: Powder surface of the compact oxide film with one-way conductive properties. Chemical properties of anodic film is chemistry stable (especially in the acidic electrolyte stability), high resistivity (7.5 x 1010¦¸ ¡¤ cm), large dielectric constant (27.6), lessleakage current, wide operating temperature range (-80 ~ 200 ¡æ), high reliability, shock, and long service life and so on. Tantalum powder is used in the manufacture of high quality electrolytic capacitor (capacitance than the same size, large capacity five times the average power and above). Tantalum powder is widely used in military equipment and high-tech fields, such as missiles, space vehicles, television sets, computer and so on.