Identification Chemical Properties Safety Data Raw materials And Preparation Products Hazard Information Material Safety Data Sheet(MSDS) Well-known Reagent Company Product Information Supplier Related Products

7446-11-9

Name Sulfur trioxide
CAS 7446-11-9
EINECS(EC#) 231-197-3
Molecular Formula O3S
MDL Number MFCD00011452
Molecular Weight 80.06
MOL File 7446-11-9.mol

Chemical Properties

Appearance Sulfur trioxide is a crystalline solid which has 3 forms: alpha-, beta-, and gamma-; and can also exist as a gas or liquid.
Melting point  16.8 °C(lit.)
Boiling point  44.8 °C
density  1.97 g/mL at 25 °C(lit.)
vapor density  2.8 (vs air)
vapor pressure  280 mm Hg ( 25 °C)
storage temp.  Indoors
solubility  reacts with H2O
form  colorless liquid
color  white needles
Stability: Stable. Incompatible with organic materials, finely powdered metals, bases, water, cyanides and a wide variety of other chemicals. Reacts violently with water, oxygen and other chemicals-read a full data sheet before use.
Water Solubility  reacts violently
Merck  13,9069
Dielectric constant 3.1(18℃)
Uses
Sulfonation of organic compounds, especially nonionic detergents, solar energy collectors. It is usually generated in the plant where it is to be used.
CAS DataBase Reference 7446-11-9(CAS DataBase Reference)
NIST Chemistry Reference Sulfur trioxide(7446-11-9)
EPA Substance Registry System 7446-11-9(EPA Substance)

Safety Data

Hazard Codes  O,T+,C
Risk Statements 
R45:May cause cancer.
R8:Contact with combustible material may cause fire.
R14:Reacts violently with water.
R26:Very Toxic by inhalation.
R34:Causes burns.
Safety Statements 
S53:Avoid exposure-obtain special instruction before use .
S17:Keep away from combustible material .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S8:Keep container dry .
S25:Avoid contact with eyes .
RIDADR  UN 1829 8/PG 1
WGK Germany  1
RTECS  WT4830000
HazardClass  8
PackingGroup  I
Safety Profile
Poison by inhalation. Human systemic effects by inhalation: cough and other pulmonary and olfactory changes. A corrosive irritant to skin, eyes, and mucous membranes. Violent reaction with O2F2, PbO, NClO2, HClO4, P, tetrafluorethylene, acetonitrile, sulfuric acid, dimethyl sulfoxide, dioxan, water, diphenylmercury, formamide, iodine, pyridine, metal oxides. Reacts with steam to form corrosive, toxic fumes of sulfuric acid. When heated to decomposition it emits toxic fumes of SO,. See also SULFURIC ACID.
Hazardous Substances Data 7446-11-9(Hazardous Substances Data)

Hazard Information

Material Safety Data Sheet(MSDS)

Well-known Reagent Company Product Information

Supplier