Tungsten , 99.9%metalsbasis,50nm , 7440-33-7

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

PRODUCT Properties

• Melting point: 3410 °C (lit.)
• Boiling point: 5660 °C (lit.)
• Density: 19.3 g/mL at 25 °C (lit.)
• vapor pressure: 0Pa at 3000℃
• Flash point: -23 °C
• storage temp.: no restrictions.
• form: wire
• Specific Gravity: 19.3
• color: Silver-gray
• Resistivity: 4.9 μΩ-cm, 20°C
• Water Solubility: insoluble
• Merck: 13,9884
• Exposure limits: ACGIH: TWA 2 ppm; STEL 4 ppm; OSHA: TWA 2 ppm(5 mg/m3); NIOSH: IDLH 25 ppm; TWA 2 ppm(5 mg/m3); STEL 4 ppm(10 mg/m3)
• Stability: Stable. Dust is flammable, though not likely to present a hazard if normal good practice is used.

Description and Uses

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.

Ferrous and nonferrous alloys, filaments in incandescent lamps, heating elements, welding electrodes, manufacture of abrasives and tools, manufacture of textiles and ceramics.

Safety

• Symbol(GHS): GHS02
• Signal word: Danger
• Hazard statements: H228-H252
• Precautionary statements: P210-P235-P240-P241-P280-P370+P378
• Hazard Codes: F,Xi,N,Xn
• Risk Statements: 11-36/38-67-65-62-51/53-48/20-38
• Safety Statements: 6-26-36-62-61-36/37-16
• RIDADR: UN 3089 4.1/PG 2
• OEB: B
• OEL: TWA: 5 mg/m3, STEL: 10 mg/m3 [*Note: The REL also applies to other insoluble tungsten compounds (as W).]
• WGK Germany: -
• RTECS: YO7175000
• TSCA: Yes
• HazardClass: 4.1
• PackingGroup: III
• HS Code: 81011000