Loading...
SITCSection 5
U.S. imports of polyamides (not elsewhere specified) in primary forms (SITC 57539) totaled $17.4M in April 2026, traded with 31 countries.
Importers of Polyamides (Not Elsewhere Specified) in Primary Forms paid $2.6M in duties in April 2026 — an effective duty rate of 17% on $15.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Polyamides (Not Elsewhere Specified) in Primary Forms imports of $17.4M in April 2026 ran 15% above the year-to-date monthly average of $15.2M.
Last updated: April 2026 dataSpecialty and novel polyamide chemistries that fall outside the enumerated PA-6 through PA-6,12 series are captured here — including high-performance variants such as semi-aromatic polyamides (polyphthalamides) used in electronics and aerospace applications. Because this is a residual 'not elsewhere specified' category, correct classification requires demonstrating that the product's monomer structure does not correspond to any of the named polyamide types in the preceding heading. Traders dealing in advanced polymer grades should maintain detailed technical documentation to support the NES classification at entry.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
A manufacturer's certificate of analysis specifying the monomer composition, along with a technical data sheet confirming the polymer does not match any enumerated PA type, is typically required. CBP may also request a laboratory analysis if the chemical identity is not self-evident from commercial documents.
Yes. Semi-aromatic polyamides whose repeat-unit structure differs from the six enumerated PA series are generally classified as NES polyamides. Importers should confirm this with a customs broker, as minor structural variations can shift classification.
Supplier Network
Get discovered by U.S. importers searching for HS 57539 — Polyamides (Not Elsewhere Specified) in Primary Forms. Be the first supplier listed.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| BELGIUM | $573K | $13.3M | +$12.8M |
| MEXICO | $647K | $12.7M | +$12.0M |
| JAPAN | $1.8M | $7.5M | +$5.7M |
| CHINA | $840K | $7.7M | +$6.8M |
| UNITED KINGDOM | $6K | $8.5M | +$8.5M |
Monthly import values over time