U.S. imports of Cyclic Polymers of Aldehydes (HS 291250) totaled $246K in August 2026, imported from 4 countries.
Importers of Cyclic Polymers of Aldehydes paid $54K in duties in August 2026, an average duty rate of 22.11% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Cyclic Polymers of Aldehydes imports of $246K in August 2026 ran 96% above the year-to-date monthly average of $125K.
Last updated: August 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.
5 import shipments a month
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.
Subheading 9 of 10 in heading 2912
Subheading 291250 · $246K of $29.0M
ImportsExports
Imports
$246KYoY · free account
Exports
—YoY · free account
Low of 8 reported months · imports
Low · free accountOver the twelve months to August 2026, the U.S. exported $905K of Cyclic Polymers of Aldehydes.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026 · imports 8 of 12 months reported, exports 11 of 12 months reported. Source: U.S. Census Bureau.
Imports · August 2026
origin
Switzerland and China together supply 98% of it. China pays 43.0% duty; Switzerland 12.5%.
customs district
destination
entry
rate provision · imports
duty collected equals 22.11% of imports for consumption.
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 |
|---|---|---|---|---|---|
| 2912501000 | Metaldehyde | $163K | 12.50% | 100.00% | $20K |
| 2912505000 | Cyclic Polymers of Aldehydes, NESOI | $83K | 41.02% | 100.00% | $34K |
Trade Directory
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