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HSChapter 29
U.S. imports of imines and their derivatives; salts thereof (nesoi) (HS 292529) totaled $35.3M in April 2026, traded with 24 countries.
Importers of Imines and Their Derivatives; Salts Thereof (NESOI) paid $4.2M in duties in April 2026 — an effective duty rate of 15% on $28.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Imines and Their Derivatives; Salts Thereof (NESOI) imports of $35.3M in April 2026 ran 43% above the year-to-date monthly average of $24.8M.
Last updated: April 2026 dataGuanidine derivatives, aromatic imines, and related salts not elsewhere specified serve as building blocks for rubber accelerators, pharmaceutical intermediates, and specialty catalysts — end-use distinctions that are directly reflected in the seven 10-digit tariff lines under this heading. Lines 2925292000 and 2925294500 separate aromatic imines destined for drug use from other aromatic imine derivatives, affecting both duty rates and potential FDA oversight. China is the primary supplier, with Germany and France also significant sources. Aromatic compounds produced by US manufacturers may be subject to domestic-industry note provisions that shift classification.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Shipments of aromatic imines intended as drug intermediates or active pharmaceutical ingredients may require FDA prior notice, Drug Master File references, and compliance with current Good Manufacturing Practice (cGMP) standards. CBP may also request end-use certification to confirm the drug-use classification rather than the general aromatic imine line.
Tetramethylguanidine is a strong, non-nucleophilic base widely used as a catalyst in polyurethane and epoxy systems, distinguishing it from the rubber-accelerator and pharmaceutical-intermediate uses of other compounds in this heading. Its dedicated 10-digit line reflects sufficient trade volume to warrant separate statistical tracking.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2925299000 | NON-AROM IMINES AND THEIR DERIV, ETC NESOI | $26.1M | 16.17% | $3.1M |
| 2925296000 | AROM IMINES AND DERIVATIVES ETC, OTHER | $6.6M | 6.94% | $448K |
| 2925291800 | N,N'-DIPHENYLGUANIDIDE; 3-DIMETHYLAMINOMETHYLENE; | $1.8M | 27.74% | $508K |
| 2925297000 | TETRAMETHYLGUANIDINE | $449K | 17.50% | $79K |
| 2925292000 | AROM IMINES AND DERIV ETC, FOR USE AS DRUGS | $300K | 6.50% | $271 |
| 2925291000 | N-(4-CHLORO-O-TOLYL)-N,N-DIMETHYLFORMAMIDINE ETC | $48K | 16.50% | $8K |
NON-AROM IMINES AND THEIR DERIV, ETC NESOI
AROM IMINES AND DERIVATIVES ETC, OTHER
N,N'-DIPHENYLGUANIDIDE; 3-DIMETHYLAMINOMETHYLENE;
TETRAMETHYLGUANIDINE
AROM IMINES AND DERIV ETC, FOR USE AS DRUGS
N-(4-CHLORO-O-TOLYL)-N,N-DIMETHYLFORMAMIDINE ETC
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2925299000 | NON-AROM IMINES AND THEIR DERIV, ETC, NESOI | $7.5M |
| 2925294500 | AROMATIC IMINES AND DERIVATIVES; SALTS THEREOF | $80K |
| 2925297000 | TETRAMETHYLGUANIDINE | $3K |
NON-AROM IMINES AND THEIR DERIV, ETC, NESOI
599.3K kg
AROMATIC IMINES AND DERIVATIVES; SALTS THEREOF
3.3K kg
TETRAMETHYLGUANIDINE
125 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 | $7.4M | $1.1M | -$6.3M |
| NORFOLK-NEWPORT NEWS, VA | $4.8M | $1.2M | -$3.5M |
| CHICAGO, IL | $5.5M | $429K | -$5.0M |