Argon

Classified under a single 10-digit line (2804210000), argon is an industrial noble gas used extensively in metal fabrication, semiconductor manufacturing, and specialty welding atmospheres where an inert blanket is required. Canada leads US import supply, followed by Austria and China, reflecting both geographic proximity and the concentration of industrial gas production infrastructure in those markets. Importers should note that argon cylinders and bulk shipments are subject to DOT hazardous materials transport regulations, and classification disputes can arise when argon is blended with other gases.