Tungsten
Synonym(s):Tungsten;W;W 00BO35;W 00BO55;W 00BO65
- CAS NO.:7440-33-7
- Empirical Formula: W
- Molecular Weight: 183.84
- MDL number: MFCD00011461
- EINECS: 231-143-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-05-20 14:01:34
What is Tungsten?
Description
Tungsten was recognized as a distinct element in 1779 by Peter Woulfe, but not isolated until 1783, by Jose and Fausto d’Elhuyar. The average tungsten concentration in the earth’s crust is ~0.006%. Tungsten occurs naturally as tungstate, mainly in compounds such as wolframites and scheelites.
The Uses of Tungsten
Tungsten, also known as wolfram, occurs as wolframite (FeWO4). It can be found in the earth’s crust but not in its pure metal form. It combines with other chemicals and compounds within the rocky earth’s crust. It is a transitional hard metal with physicochemical properties and can also be manufactured commercially (Lassner and Schnubert, 1999; Gbaruko and Igwe, 2007; Stefaniak, 2010; Strigul et al., 2010).
Tungsten is most commonly used to increase the hardness of steel. It is available commercially in the form of powder, single crystal, and ultrapure granule grades. It is also used in the manufacturing of alloys, light filaments, and X-ray tubes. A recent use for tungsten is as a lead substitute during the manufacturing of ammunition and sporting good products. Another recent commercial use for tungsten is in the production of wedding bands. It is also used as a catalyst in chemical reactions (Lassner and Schnubert, 1999; Gbaruko and Igwe, 2007; Stefaniak, 2010; Strigul et al., 2010).
To increase hardness, toughness, elasticity, and tensile strength of steel; manufacture of alloys; manufacture of filaments for incandescent lamps and in electron tubes; in contact points for automotive, telegraph, radio and television apparatus; in phonograph needles. Tungsten carbides (W2C, WC) used in rock drills, metal-cutting tools, wire-drawing dies. WC used as catalyst instead of platinum: Bennett et al., Science 184, 563 (1974).
Properties of Tungsten
Melting point: | 3410 °C (lit.) |
Boiling point: | 5660 °C (lit.) |
Density | 19.3 g/mL at 25 °C (lit.) |
Flash point: | -23 °C |
storage temp. | no restrictions. |
form | wire |
color | Silver-gray |
Water Solubility | insoluble |
Safety information for Tungsten
Signal word | Danger |
Pictogram(s) |
Flame Flammables GHS02 |
GHS Hazard Statements |
H228:Flammable solids H252:Self-heating substances and mixtures |
Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P235:Keep cool. P240:Ground/bond container and receiving equipment. P241:Use explosion-proof electrical/ventilating/lighting/…/equipment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P370+P378:In case of fire: Use … for extinction. |
Computed Descriptors for Tungsten
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