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HSChapter 29
U.S. imports of cyclic polymers of aldehydes (HS 291250) totaled $148K in April 2026, traded with 3 countries.
Importers of Cyclic Polymers of Aldehydes paid $15K in duties in April 2026 — an effective duty rate of 10% on $148K in dutiable value, based on actual customs collections rather than the published tariff schedule. Cyclic Polymers of Aldehydes imports of $148K in April 2026 ran 122% above the year-to-date monthly average of $67K.
Last updated: April 2026 dataMetaldehyde — a cyclic tetramer of acetaldehyde used primarily as a molluscicide (slug and snail bait) in agricultural and horticultural applications — is the commercially dominant product under this heading, classified at 2912501000 in powder or crystal form. The residual line (2912505000) covers other cyclic aldehyde polymers such as paraldehyde. Switzerland and Germany lead US supply, reflecting the concentration of specialty agrochemical and fine-chemical manufacturing in those countries. Metaldehyde-containing pesticide products are subject to EPA registration requirements, though the bulk chemical intermediate itself enters under standard CBP procedures.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Bulk metaldehyde as a chemical intermediate (2912501000) typically enters under standard CBP procedures without requiring a pesticide registration. However, formulated metaldehyde products intended for use as pesticides must be registered with the EPA under FIFRA before they can be imported or sold in the US. Importers should clearly distinguish between the bulk chemical and finished pesticide formulations in their entry documentation.
Metaldehyde (2912501000) is a cyclic polymer of acetaldehyde (CH₃CHO) and classifies under heading 2912. Paraformaldehyde (2912600000) is a linear polymer of formaldehyde (HCHO) and classifies under a separate heading. Despite both appearing as white powders or granules, they are chemically distinct and their HTS lines are not interchangeable; a certificate of analysis confirming the monomer identity is essential for correct classification.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| SWITZERLAND | $148K | -- | -$148K |
| SOUTH AFRICA | -- | $105K | +$105K |
| CANADA | -- | $75K | +$75K |
| THAILAND | -- | $5K | +$5K |
| CHINA | -- | -- | -- |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2912501000 | METALDEHYDE | $148K | 10.00% | $15K |
| 2912505000 | CYCLIC POLYMERS OF ALDEHYDES, NESOI | $0 | -- | -- |
METALDEHYDE
CYCLIC POLYMERS OF ALDEHYDES, NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2912501000 | METALDEHYDE (POWDER OR CRYSTAL FORM) | $105K |
| 2912505000 | CYCLIC POLYMERS OF ALDEHYDES, NESOI | $80K |
METALDEHYDE (POWDER OR CRYSTAL FORM)
36.3K kg
CYCLIC POLYMERS OF ALDEHYDES, NESOI
20.2K 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
| State | Imports | Exports | Balance |
|---|---|---|---|
| Idaho | $148K | -- | -$148K |
| Washington | -- | $105K | +$105K |
| Kansas | -- | $75K | +$75K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| HOUSTON, TX | $148K | -- | -$148K |
| SEATTLE, WA | -- | $105K | +$105K |
| PORTAL, ND | -- | $75K | +$75K |