Sulfur Dioxide Gas (SO2) What is sulfur dioxide? PurityPlus® carries compressed sulfur dioxide gas at a variety of concentrations and purities. Sulfur dioxide (SO2) is a nonflammable, colorless, toxic, irritating, liquefied gas that is shipped under its own vapor pressure in ton containers, cylinders, or small tanks. Sulfur dioxide occurs naturally from volcanic occurrences and is formed through the combustion of hydrocarbons in the atmosphere that contain sulfur. The means by which sulfur dioxide is generated is dependent on the demand for other products, so commercial production of the gas is usually as a byproduct of other manufacturing. Uses for sulfur dioxide Sulfur dioxide is most frequently employed in petroleum refining. Likewise, since the infancy of wine production, first recorded by the ancient Romans, SO2 has found a wide use in the reduction of the oxidation of fermenting spirits. The most common use of packaged sulfur dioxide to this day is as a preservative in the process of winemaking. SO2 has also realized popularity as a preservative for dried fruits. Additionally, sulfur dioxide is used to generate part-per-million level calibration gas mixtures for environmental emission monitoring and the petrochemical industry. Where to buy sulfur dioxide We invite anyone in search of a reliable source of sulfur dioxide to locate and contact their local PurityPlus® specialty gas producer using the Locate Your Nearest Provider tool. You can also reach out to us on our website or give us a call at 877-81P-PLUS (877-817-7587) if you have any questions or would like additional information about PurityPlus® and the wide variety of specialty gases we offer. PurityPlus also provides a Sulfur Dioxide SDS available via this link or in the sidebar.