Selenium dioxide , AR,99% , 7446-08-4

Synonym(s):
NSC 56753;Selenious anhydride, Selenium(IV) oxide;Selenium dioxide;Selenium oxide

CAS NO.：7446-08-4

Empirical Formula: O2Se

Molecular Weight: 110.96

MDL number: MFCD00003562

EINECS: 231-194-7

PRODUCT Properties

• Melting point: 315 °C (subl.)(lit.)
• Boiling point: 684.9 °C(lit.)
• Density: 4.81 g/mL at 25 °C(lit.)
• vapor pressure: 1 mm Hg ( 157 °C)
• refractive index: nD20 <1.76
• Flash point: 315°C
• storage temp.: Store below +30°C.
• solubility: H₂O: soluble
• form: powder
• color: white
• Specific Gravity: 3.95
• PH: 2 (10g/l, H2O, 20℃)
• Water Solubility: 38.4 g/100 mL (14 ºC)
• Sublimation: 315 ºC
• Merck: 14,8434
• crystal system: square
• Space group: P42/mbc
• Lattice constant:
  • a/nm: 0.83622
  • b/nm: 0.83622
  • c/nm: 0.50612
  • α/o: 90
  • β/o: 90
  • γ/o: 90
  • V/nm3: 0.3539
• Exposure limits: ACGIH: TWA 0.2 mg/m3; NIOSH: IDLH 1 mg/m3; TWA 0.2 mg/m3
• Stability: Stable. Incompatible with organic materials, strong acids, ammonia, nitric acid, halogen acids. Protect from moisture.
• CAS DataBase Reference: 7446-08-4(CAS DataBase Reference)
• NIST Chemistry Reference: Selenium dioxide(7446-08-4)
• EPA Substance Registry System: Selenium dioxide (7446-08-4)

Description and Uses

Selenium dioxide (SeO2) is used as an oxidizing agent, as a catalyst, and as an antioxidant for lubricating oils and grease.

Safety

• Symbol(GHS): GHS06,GHS08,GHS09
• Signal word: Danger
• Hazard statements: H301+H331-H373-H410
• Precautionary statements: P273-P301+P310+P330-P304+P340+P311-P314
• Hazard Codes: T,N,Xn
• Risk Statements: 36/38-50/53-33-23/25-51/53-20/22
• Safety Statements: 26-61-60-45-28A-20/21-28
• RIDADR: UN 3440 6.1/PG 3
• WGK Germany: 2
• RTECS: VS8575000
• F: 3
• TSCA: Yes
• HS Code: 2811 29 90
• HazardClass: 6.1
• PackingGroup: II
• Hazardous Substances Data: 7446-08-4(Hazardous Substances Data)
• Toxicity: LD50 orally in Rabbit: 68.1 mg/kg