U.S. exports of Polyamides (Not Elsewhere Specified) in Primary Forms (SITC 57539) totaled $64.2M in August 2026.
Importers of Polyamides (Not Elsewhere Specified) in Primary Forms paid $2.3M in duties in August 2026, an average duty rate of 12.44% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Polyamides (Not Elsewhere Specified) in Primary Forms imports of $18.5M in August 2026 ran 10% above the year-to-date monthly average of $16.8M.
Last updated: August 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.
480 import shipments a month
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.
Basic heading 92 of 465 in section 5
Basic heading 57539 · $64.2M of $26.2B
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Exports · August 2026
destination
Mexico and United Kingdom together take 40% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$18.5MYoY · free account
Exports
$64.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $178.8M of Polyamides (Not Elsewhere Specified) in Primary Forms and exported $785.7M.
Through August 2026. Source: U.S. Census Bureau.