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You'd have to contact them directly to buy it, and they may ask what you want it for, but it's not a controlled substance. From their site:
Founded in 1995, Concorde Specialty Gases is a leading independent producer and distributor of specialty gases utilized in a variety of industrial, commercial and consumer applications.
Concorde is your sole source for Super SF6. Made via a proprietary chemistry and manufacturing process, Super SF6 is a unique formula of sulfur hexafluoride that sets a higher standard for purity, quality and low moisture content.
All SF6 gases are not created equal. Utilizing proprietary chemistries and refining technologies, Concorde has created Super SF6 gas. It is a superior quality Sulfur Hexafluoride which features the lowest moisture content and least amount of impurities of any SF6 gas in its class.
Super SF6 (Sulfur Hexafluoride) is an inert, non-toxic gas with excellent physical properties, including dielectric, cooling, insulating and arc quenching capabilities. With its unique physical properties, Concorde Super SF6 is ideal for applications such as: electric utilities, magnesium casting, sound insulation, semiconductor etching, nuclear accelerators, scientific and medical instrumentation and more.
We certify that this gas complies with the requirements of ASTM D2472-00, IEC 376, and GB12022-89. Water content, maximum dew point, -62° C
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