U.S. exports of Cyclic Hydrocarbons, N.E.S. (SITC 51129) totaled $31.3M in August 2026.
Importers of Cyclic Hydrocarbons, N.E.S. paid $785K in duties in August 2026, an average duty rate of 9.73% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Cyclic Hydrocarbons, N.E.S. imports of $8.1M in August 2026 ran 25% below the year-to-date monthly average of $10.8M.
Last updated: August 2026 dataCyclic hydrocarbons not elsewhere specified encompass aromatic and alicyclic compounds that do not qualify under any of the named cyclic hydrocarbon headings — including naphthalene derivatives, higher alkylbenzenes, and specialty ring-structure intermediates used in dyes, agrochemicals, and fine chemicals. The residual nature of this heading makes it a frequent site of classification disputes, particularly for multi-ring or partially hydrogenated structures whose placement between cyclic and heterocyclic categories is ambiguous. Importers should document the precise chemical identity, CAS number, and purity of each substance to support classification and EPA TSCA compliance.
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214 import shipments a month
This heading captures cyclic hydrocarbon compounds that are not specifically named elsewhere — examples include higher alkylbenzenes, decalin (decahydronaphthalene), tetralin (tetrahydronaphthalene), and certain polycyclic aromatic hydrocarbons used in specialty chemical synthesis. If a compound could plausibly fit a named heading, that named heading takes precedence; the NES heading is strictly residual.
A certificate of analysis showing the compound's CAS number, chemical name, molecular structure, and purity level is the foundation for classification support. Importers should also retain the supplier's technical data sheet and, for novel or ambiguous substances, consider requesting a binding ruling from US Customs and Border Protection before the first shipment to avoid reclassification and penalty exposure.
Basic heading 139 of 465 in section 5
Basic heading 51129 · $31.3M of $26.2B
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Exports · August 2026
destination
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$8.1MYoY · free account
Exports
$31.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $123.2M of Cyclic Hydrocarbons, N.E.S. and exported $259.5M.
Through August 2026. Source: U.S. Census Bureau.