A7714112
Tungsten , 99.99%metalsbasis,25μm , 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
| Pack Size | Price | Stock | Quantity |
| 25g | RMB79.20 | In Stock |
|
| 100G | RMB239.20 | In Stock |
|
| 500G | RMB799.20 | In Stock |
|
| others | Enquire |
Update time: 2022-07-08
PRODUCT Properties
| Melting point: | 3410 °C (lit.) |
| Boiling point: | 5660 °C (lit.) |
| Density | 19.3 g/mL at 25 °C (lit.) |
| bulk density | 4000kg/m3 |
| vapor pressure | 0Pa at 3000℃ |
| Flash point: | -23 °C |
| storage temp. | no restrictions. |
| form | wire |
| color | Silver-gray |
| Specific Gravity | 19.3 |
| Flame Color | Green |
| 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. |
| Poissons Ratio | 0.28 |
| Hardness, Brinell | 444, Converted from Vickers for 3000 kg load/10 mm ball Brinell test. Drawn and annealed. |
| Hardness, Knoop | 505, Estimated from Vickers. |
| Hardness, Rockwell A | 74, Converted from Vickers. Drawn and annealed. |
| Hardness, Vickers | 480, Drawn and annealed. |
| Shear Modulus | 156 GPa, Calculated |
| Hardness, Rockwell C | 47, Converted from Vickers. Drawn and annealed. |
| Modulus of Elasticity | 400 GPa |
| CAS DataBase Reference | 7440-33-7(CAS DataBase Reference) |
| NIST Chemistry Reference | Tungsten(7440-33-7) |
| EPA Substance Registry System | Tungsten (7440-33-7) |
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 |
| Hazardous Substances Data | 7440-33-7(Hazardous Substances Data) |