Sulfur Dioxide
SO2
Home | Contact Us | Profile | Quote Request
Gas Mixtures | Refrigerants | Pure Gas | Sulfur
Equipment | Defense Services |
Guest book
Periodic Chart Chart Index Reference

General Characteristics Health Hazards Material Recommendations
A colorless, nonflammable and liquefied gas with a penetrating odor. A toxic substance that irritates the eyes and air passages Normal materials can be used. Avoid copper and silver and their alloys when used under high pressure or temperature.
TLV-TWA Flammable Limits DOT Class / Label
2 ppm Nonflammable 2.3 / Poison Gas
Molecular Weight Specific Gravity Specific Volume
64.1 2.262 @ 70° F 5.9 cu.ft./lb @ 70° F
CGA Valve Outlet CAS Registry No. UN Number
660 7446-09-5 1079
National Stock Number (NSN) Applicable to SO2 MIL Specs/ Fed Specs
MSDS for SO2


Grade
Part #
Purity Minimum Cylinder
Size
Volume
LBS
Pressure
@ 70 F
Comments
Anhydrous
404600
99.98%
Liquid Phase
761
054
016
007
2000
150
40
3
34
34
34
34

None


Uses: Sulfur Dioxide - SO2 - A colourless, nonflammable and liquefied gas with a penetrating odor. A toxic substance that irritates the eyes and air passages. The use of sulfur dioxide are many, some of which are: preservative for beer, wine, and meats; in the manufacture of sulfite and hydrogen sulfites, solvent extraction and as a refrigerant in the ice industry.

Sulfur dioxide is a heavy, colourless, poisonous gas with a pungent, irritating odour familiar as the smell of a just-struck match. Occurring in nature in volcanic gases and in solution in the waters of some warm springs, sulfur dioxide usually is prepared industrially by the burning in air or oxygen of sulfur or such compounds of sulfur as iron pyrite or copper pyrite. Large quantities of sulfur dioxide are formed in the combustion of sulfur-containing fuels; in the second half of the 20th century, measures to control atmospheric pollution by this compound were widely adopted. In the laboratory the gas may be prepared by reducing sulfuric acid (H2SO4) to sulfurous acid (H2SO3), which decomposes into water and sulfur dioxide, or by treating sulfites (salts of sulfurous acid) with strong acids, such as hydrochloric acid, again forming sulfurous acid.

Sulfur dioxide can be liquefied under moderate pressures at room temperatures; the liquid freezes at -73° C (-99.4° F) and boils at -10° C (+14° F) under atmospheric pressure. Although its chief uses are in the preparation of sulfuric acid, sulfur trioxide, and sulfites, sulfur dioxide also is used as a disinfectant, a refrigerant, a bleach, and a food preservative, especially in dried fruits.