Sulfur Dioxide Supplier to Indianapolis American Welding & Gas, Inc. is a dependable supplier of Sulfur Dioxide (SO2) to many commercial customers in the Indianapolis area. Sulphur Dioxide is a colorless, irritating, nonflammable, lethal, liquefied gas shipped under its own vapor pressure in cylinders, ton containers, or small (1,000–5,000 gallon) tanks. Sulfur dioxide shows up in nature, most especially as a result of volcanic eruptions, when hydrocarbons containing sulfur combust in the atmosphere. Commercial production is nearly always as a byproduct of other manufacturing, the technique for producing it being dependent upon the call for other products. A source most often relied upon for sulfur dioxide has been the creation of calcium silicate cement from calcium sulfate and coke. Undoubtedly the largest use of sulfur dioxide is in petroleum refining. Through the Claus Process, petroleum refiners end up with elemental sulfur and water when they mix sulfur dioxide with hydrocarbons containing hydrogen sulfide. Ever since wine production was first documented by the ancient Romans, sulfur dioxide has been applied almost universally to reduce the oxidation of fermenting spirits. The most frequent use of packaged sulfur dioxide continues to be as a preservative in winemaking. SO2 enjoys use also as preservative for dried fruits; it allows fruits to hold on to their color and reduces the growth of microorganisms. Back in time, predating the synthesis and commercialization of chlorofluorocarbons in the 1930’s, sulfur dioxide, as well as ammonia and methyl chloride, found extensive use in mechanical refrigeration. Today, SO2 is further used generate part-per-million-level calibration gas mixtures for the petrochemical industry and environmental emission monitoring. Looking for a dependable source of sulfur dioxide in Indianapolis? Call us, American Welding & Gas, Inc., at or contact us online. We distribute PurityPlus® sulfur dioxide pretty much everywhere in this area. You can be sure we also offer other products from PurityPlus®, the most respected name in specialty gases.