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HSChapter 29
U.S. imports of unfused thiazole ring heterocyclic compounds (HS 293410) totaled $17.2M in April 2026, traded with 15 countries.
Importers of Unfused Thiazole Ring Heterocyclic Compounds paid $978K in duties in April 2026 — an effective duty rate of 9.7% on $10.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Unfused Thiazole Ring Heterocyclic Compounds imports of $17.2M in April 2026 ran 34% below the year-to-date monthly average of $26.2M.
Last updated: April 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.
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.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| JAPAN | $4.5M | -- | -$4.5M |
| CHINA | $4.4M | $30K | -$4.4M |
| GERMANY | $3.8M | $155K | -$3.6M |
| KOREA, SOUTH | $2.4M | $28K | -$2.3M |
| INDIA | $1.8M | $7K | -$1.8M |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2934109000 | OTHER CMPDS(EXC AROM OR MOD-AROM) CONT THIAZOL ETC | $10.4M | 11.22% | $735K |
| 2934101000 | AROM OR MOD-AROM PROD IN U.S. NOTE 3 SECT 6 ETC | $3.9M | 0.60% | $8K |
| 2934107000 | 4,5-DICHLORO-2-N-OCTY-4-ISOTIAZOLIN-3-ONE; ETC. | $1.8M | 10.00% | $162K |
| 2934102000 | AROM OR MOD-AROM PRODUCTS (EXC PROD IN U.S. NT3)ET | $1.2M | 13.85% | $73K |
OTHER CMPDS(EXC AROM OR MOD-AROM) CONT THIAZOL ETC
AROM OR MOD-AROM PROD IN U.S. NOTE 3 SECT 6 ETC
4,5-DICHLORO-2-N-OCTY-4-ISOTIAZOLIN-3-ONE; ETC.
AROM OR MOD-AROM PRODUCTS (EXC PROD IN U.S. NT3)ET
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2934100000 | CMPDS CONT AN UNFUSED THIAZOLE RING IN THE STRUCT | $3.1M |
CMPDS CONT AN UNFUSED THIAZOLE RING IN THE STRUCT
11.2K kg
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
COMP WITH PYRIMIDINE OR PIPERAZINE RING, NESOI
HS 293359
ANTIBIOTICS, NESOI
HS 294190
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LOS ANGELES, CA | $6.9M | $17K | -$6.8M |
| CHARLESTON, SC | $3.4M | -- | -$3.4M |
| CHICAGO, IL | $2.0M | $941K | -$1.0M |