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12070-12-1

Name TUNGSTEN CARBIDE
CAS 12070-12-1
EINECS(EC#) 235-123-0
Molecular Formula CW
MDL Number MFCD00011464
Molecular Weight 195.85
MOL File 12070-12-1.mol

Chemical Properties

Definition A ditungsten carbide, W2C, with similar physical properties is also known. WC is said to be the strongest of all structural materials.
Appearance Gray powder. Mohs hardness of 9+ in solid form. Insoluble in water but readily attacked by a nitric acid– hydrofluoric acidmixture. Stable to 400C with chlorine, burns in fluorine at room temperature, oxidizes on heating in air.
Melting point  2870°C
Boiling point  6000°C
density  15,63 g/cm3
solubility  insoluble in H2O; soluble in HNO3/HF
form  powder
color  Gray
Specific Gravity 15.63
Resistivity 19.2 (ρ/μΩ.cm)
Water Solubility  Soluble in nitric acid and hydrofluroic acid. Insoluble in water.
Crystal Structure Hexagonal
Merck  14,9815
Exposure limits ACGIH: TWA 3 mg/m3
NIOSH: TWA 5 mg/m3; STEL 10 mg/m3
Uses
Tungsten Carbide/Carbon (WC/C) is a black-gray colored coating of hard tungsten carbide particles in a soft amorphous carbon matrix. It is used for precision components with abrasive and adhesive wear, seizure problems (poor lubrication) and for dry machining applications.
IARC 2A (Vol. 86) 2006
EPA Substance Registry System Tungsten monocarbide (12070-12-1)

Safety Data

Hazard Codes  T
Risk Statements 
Safety Statements 
RIDADR  UN3178
WGK Germany  -
RTECS  YO7250000
TSCA  Yes
HazardClass  4.1
PackingGroup  III
HS Code  28499020
Safety Profile
Chronic inhalation causes lung damage in humans. Ignites at 600°C in nitrogen oxide atmospheres. Violent reaction with F2, ClF3, NOx, IF5, PbO2, NO2, N20. See also TUNGSTEN COMPOUNDS.

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