No — both sulfuric acid and oleum (fuming sulfuric acid) are classified together under subheading 280700. There is no separate HS6-level split between the two forms, though concentration and grade distinctions may matter for pricing and safety documentation.

Importers must file a TSCA certification (either positive or negative) with US Customs and Border Protection. DOT hazmat regulations govern transport packaging and labeling. Shipments from Canada and Mexico also require standard USMCA origin documentation if preferential tariff treatment is sought.