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EINECS 231-135-5
CAS No. 7440-25-7 Density 16,6 g/cm3
PSA 0.00000 LogP 0.00000
Solubility very resistant to attack by acids except HF, resistant to alkali solutions [KIR83] Melting Point 2996 ºC(lit.)
Formula Ta Boiling Point 5425 ºC(lit.)
Molecular Weight 180.9479 Flash Point N/A
Transport Information UN 3089 4.1/PG 2 Appearance wire
Safety S16-26-33-36/37/39 Risk Codes 11-36/37/38
Molecular Structure Molecular Structure of 7440-25-7 (Tantalum) Hazard Symbols FlammableFIrritantXiHarmfulXn



Tantalum History

  Tantalum (CAS NO.7440-25-7) was discovered in Sweden in 1802 by Anders Ekeberg.
In 1809, the English chemist William Hyde Wollaston kept the name tantalum.
In 1903,Werner von Bolton produced the first relatively pure ductile metal.

Tantalum Consensus Reports

Reported in EPA TSCA Inventory.

Tantalum Standards and Recommendations

OSHA PEL: TWA 5 mg/m3
ACGIH TLV: TWA 5 mg/m3
DFG MAK: 4 mg/m3

Tantalum Specification

Tantalum, with the cas registry number 7440-25-7, is a kind of black gray odorless solid. This chemical is stable chemically and could be soluble in concentrated sulfuric acid and strong phosphoric acid in high temperature. Its product categories are various, including Inorganics; TantalumMetal and Ceramic Science; Catalysis and Inorganic Chemistry; Chemical Synthesis; Metal and Ceramic Science; Metals; Tantalum; 73: Ta; TantalumNanomaterials; Materials Science; Nanomaterials; Nanoparticles: Metals and Metal AlloysMetal and Ceramic Science; Nanopowders and Nanoparticle Dispersions. As to its usage, it is usually used in tantalum capacitor and also in the carbide of pen point and tantalum.

The characteristics of Tantalum are as follows: (1)#H bond acceptors: 0; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 0; (4)Polar Surface Area: 0; (5)Exact Mass: 180.947996; (6)MonoIsotopic Mass: 180.947996; (7)Heavy Atom Count: 1; (8)Covalently-Bonded Unit Count: 1; (9)Melting point: 2996 °C; (10)Boiling Point: 5425 °C; (11)Density: 16,6 g/cm3; (12)Vapor Pressure: <0.01 mm Hg ( 537.2 °C).

Uses of Tantalum: The major use for tantalum, as the metal powder, is in the production of electronic components, mainly capacitors and some high-power resistors. Tantalum is also used to produce a variety of alloys that have high melting points, are strong and have good ductility. Except for these, Tantalum is extremely inert and is therefore formed into a variety of corrosion resistants parts, such as thermowells, valve bodies, and tantalum fasteners.

When you are using Tantalum, you should be very cautious. For one thing, it is important which may cause inflammation to the skin or other mucous membranes, and it is irritating to eyes, respiratory system and skin. For another thing, it is harmful which may cause damage to health. If by inhalation, in contact with skin and if swallowed, it will be very dangrous. In addition, it is highly flammable which may catch fire in contact with air, only needing brief contact with an ignition source, and it has a very low flash point or evolve highly flammable gases in contact with water.

Due to so many dangers above, you should take the different measures to deal with different cases. Wear suitable protective clothing, gloves and eye/face protection and then take precautionary measures against static discharges. If in case of contact with eyes, rinse immediately with plenty of water and seek medical advice. When store this chemical, keep it away from sources of ignition. 

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