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U.S. imports of unfused thiazole ring heterocyclic compounds (HS 293410) totaled $24.1M in July 2026, traded with 19 countries.
Importers of Unfused Thiazole Ring Heterocyclic Compounds paid $3.3M in duties in July 2026 — an effective duty rate of 18% on $18.7M in dutiable value, based on actual customs collections rather than the published tariff schedule. Unfused Thiazole Ring Heterocyclic Compounds imports of $24.1M in July 2026 ran 14% below the year-to-date monthly average of $28.0M.
Last updated: July 2026 dataCompounds containing an unfused thiazole ring serve as intermediates across pharmaceuticals, agrochemicals, and specialty industrial chemistry. The US tariff schedule divides this heading between aromatic/modified-aromatic products covered by Additional US Note 3 to Section VI (2934101000), other aromatic products (2934102000), specifically enumerated compounds such as 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (2934107000) — a widely used marine antifouling and industrial biocide — and non-aromatic compounds (2934109000). The isothiazolinone biocide subheading is particularly active in trade, as these compounds are used in paints, wood preservatives, and cooling-water treatment. EPA registration under FIFRA applies to thiazole-ring compounds imported for pesticidal or biocidal use.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
134 shipments/mo
The primary commercial drivers are biocidal applications (isothiazolinones in antifouling coatings, industrial water treatment, and wood preservation), pharmaceutical synthesis intermediates, and agrochemical active ingredients. The specific subheading depends on the compound's ring structure, aromatic character, and declared use, so importers should document the intended application carefully.
Yes. This compound (DCOIT) is a registered antimicrobial pesticide under FIFRA, used in antifouling marine coatings and industrial preservatives. Importing it for pesticidal use requires that the product be covered by an active EPA registration. Shipments of unregistered or off-label formulations may be refused entry or detained by EPA.
HSChapter 29
Subheading 2 of 6 in heading 2934
Subheading 293410 · $24.1M of $575.4M
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ImportsExports
Imports
$24.1MYoY · Pro
Exports
$866KYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2934109000 | Other Cmpds(Exc Arom or Mod-Arom) Cont Thiazol Etc | $12.8M | 19.10% | 78.57% | $2.5M |
| 2934107000 | 4,5-Dichloro-2-N-Octy-4-Isotiazolin-3-One; Etc. | $7.8M | 9.80% | 97.97% | $761K |
| 2934101000 | Arom or Mod-Arom Prod in U.S. Note 3 Sect 6 Etc | $2.5M | 4.24% | 42.01% | $104K |
| 2934102000 | Arom or Mod-Arom Products (Exc Prod in U.S. Nt3)Et | $1.0M | 0.10% | 0.31% | $1K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2934100000 | Cmpds Cont An Unfused Thiazole Ring in the Struct | $866K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · July 2026
origin
China and India together supply 76% of it.
customs district
destination
entry
rate provision · imports
26.7% enters free of duty; the effective duty rate is 13.78%.