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SITCSection 5
U.S. imports of inorganic oxygen compounds of nonmetals, not elsewhere specified (SITC 52239) totaled $10.2M in April 2026, traded with 31 countries.
Importers of Inorganic Oxygen Compounds of Nonmetals, Not Elsewhere Specified paid $1.1M in duties in April 2026 — an effective duty rate of 15% on $7.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataNonmetal oxides and oxyacid anhydrides not captured by more specific SITC headings — including compounds such as dinitrogen tetroxide, sulfur trioxide, and various phosphorus oxides — are grouped here as a residual NES category. The commercial significance of individual substances varies widely: some serve as reactive intermediates in chemical synthesis, others as specialty oxidizers or catalyst components in industrial processes. Precise chemical identification is essential at entry, as the specific compound determines the applicable DOT hazard class, EPA TSCA certification requirement, and any dual-use export-control obligations that may apply to re-export. Importers dealing with reactive or oxidizing nonmetal oxides should confirm that receiving facilities hold appropriate EPA and OSHA permits.
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Because this is a residual category, the importer must provide a precise chemical name, CAS number, and molecular formula on the entry documentation to support correct classification. A licensed customs broker familiar with inorganic chemicals should review whether a more specific SITC or HTS heading applies before defaulting to the NES classification, as misclassification can affect duty rates and regulatory review pathways.
Most inorganic chemical substances imported for commercial use require either a positive or negative TSCA certification. However, certain substances may be exempt if they qualify as a TSCA-excluded article, a naturally occurring substance, or a substance used solely for research and development in small quantities. Importers should verify the TSCA status of each specific compound with their customs broker or legal counsel before shipment.
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Monthly import values over time