Harmonized System
U.S. imports of Unfused Thiazole Ring Heterocyclic Compounds (HS 293410) totaled $30.4M in August 2026, imported from 20 countries.
Importers of Unfused Thiazole Ring Heterocyclic Compounds paid $4.9M in duties in August 2026, an average duty rate of 16.05% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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.
171 import shipments a month
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.
Subheading 2 of 6 in heading 2934
Subheading 293410 · $30.4M of $324.9M
Trade Directory
List your company under HS 293410 — Unfused Thiazole Ring Heterocyclic Compounds, so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2934109000 | Other Cmpds(Exc Arom or Mod-Arom) Cont Thiazol Etc | $19.7M | 20.34% | 99.47% | $4.0M |
| 2934101000 | Arom or Mod-Arom Prod in U.S. Note 3 Sect 6 Etc | $5.9M | 8.03% | 77.27% | $474K |
| 2934107000 | 4,5-Dichloro-2-N-Octy-4-Isotiazolin-3-One; Etc. | $4.0M | 11.11% | 94.74% | $449K |
| 2934102000 | Arom or Mod-Arom Products (Exc Prod in U.S. Nt3)Et | $1.1M | 0.39% | 1.99% | $4K |
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 | $527K |
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.
ImportsExports
Imports
$30.4MYoY · free account
Exports
$527KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $323.0M of Unfused Thiazole Ring Heterocyclic Compounds and exported $18.5M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
Germany and China together supply 80% of it. China pays 29.1% duty; Japan 0.5%.
customs district
entry
rate provision · imports
9.0% enters free of duty; duty collected equals 16.05% of imports for consumption.