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1314-35-8

Name Tungsten trioxide
CAS 1314-35-8
EINECS(EC#) 215-231-4
Molecular Formula O3W
MDL Number MFCD00011466
Molecular Weight 231.84
MOL File 1314-35-8.mol

Chemical Properties

Appearance Canary-yellow, heavy powder, darkorange when heated and regains original color on cooling. Insoluble in water, soluble in caustic alkalies, soluble with difficulty in acids. Noncombustible.
Melting point  1470-1475 °C
Boiling point  1837°C (estimate)
density  7.16 g/mL at 25 °C(lit.)
storage temp.  Room Temperature
solubility  insoluble in H2O, organic solvents; slightly soluble in acid solutions; soluble in alkaline solutions
form  powder
color  Yellow to greenish-yellow
Specific Gravity 7.16
Water Solubility  insoluble
Merck  14,9817
Exposure limits ACGIH: TWA 3 mg/m3
NIOSH: TWA 5 mg/m3; STEL 10 mg/m3
InChIKey ZNOKGRXACCSDPY-UHFFFAOYSA-N
CAS DataBase Reference 1314-35-8(CAS DataBase Reference)
NIST Chemistry Reference Tungsten trioxide(1314-35-8)
EPA Substance Registry System 1314-35-8(EPA Substance)

Safety Data

Hazard Codes  Xn
Risk Statements 
R22:Harmful if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
S37/39:Wear suitable gloves and eye/face protection .
WGK Germany  -
RTECS  YO7760000
21
TSCA  Yes
HS Code  28259012
Safety Profile
Moderately toxic by ingestion. Can react violently with ClF3, Li, Cl2. See also TUNGSTEN COMPOUNDS.
Hazardous Substances Data 1314-35-8(Hazardous Substances Data)
Toxicity
rat,LD50,oral,1059mg/kg (1059mg/kg),BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)BEHAVIORAL: EXCITEMENTBEHAVIORAL: MUSCLE WEAKNESS,Hygiene and Sanitation Vol. 31(7-9), Pg. 197, 1966.

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