SITCSection 5

Other Styrene Polymers in Primary Forms (N.E.S.)

Name: Other Styrene Polymers in Primary Forms (N.E.S.) (SITC 57299) -- U.S. Export Data
Creator: U.S. Census Bureau
License: https://www.census.gov/about/policies/open-gov/open-data.html

SITC 57299Basic heading5-digit

U.S. imports · July 2026: $18.5M; YTD $118.3M

U.S. exports · July 2026: $52.5M

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Balance · July 2026: Loading the trade balance

U.S. exports of other styrene polymers in primary forms (n.e.s.) (SITC 57299) totaled $52.5M in July 2026.

Importers of Other Styrene Polymers in Primary Forms (N.E.S.) paid $1.8M in duties in July 2026 — an effective duty rate of 14% on $12.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.

Last updated: July 2026 data

Styrene-butadiene copolymers, styrene-maleic anhydride resins, and other styrene-based polymers not captured by the named headings for polystyrene, SAN, or ABS are grouped here. Because this is a residual category, classification requires affirmatively ruling out all named styrene polymer headings, and the comonomer identity and ratio are the decisive technical facts. Specialty resins in this group serve niche applications in automotive, packaging, and adhesive markets where tailored thermal or mechanical properties are required.

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438 shipments/mo

12-month trend

ImportsExports

Imports

$18.5MYoY · Pro

Exports

$52.5MYoY · Pro

12-mo low · imports

YoY · Pro

$58.6M$0

June 2025December 2025July 2026

Through July 2026. Source: U.S. Census Bureau.

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Basic heading 187 of 465 in section 5

Share of section 5 imports0.06%

Basic heading 57299 · $18.5M of $28.9B

Where it comes from, where it lands, what it pays

Exports · July 2026

Countries

destination

Mexico and China together take 56% of it.

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Districts

customs district

Census does not publish district detail for this classification system.

States

origin

Census does not publish state detail for this classification system.

Ports

entry

Census does not publish port detail for this classification system.

Frequently Asked Questions

What technical documentation should importers prepare for styrene polymers classified as N.E.S.?

A detailed certificate of analysis identifying the comonomer(s), their weight percentages, and the absence of butadiene (which would indicate ABS) or acrylonitrile alone (which would indicate SAN) is essential. A binding ruling from CBP is advisable for novel copolymer formulations to avoid reclassification risk.

Can a styrene-butadiene block copolymer used as a thermoplastic elastomer fall under this heading?

Potentially, but the classification depends on whether the material is considered a styrene polymer or a synthetic rubber under the applicable nomenclature rules. Thermoplastic elastomers with high butadiene content may be classified under rubber headings rather than plastics headings. A licensed customs broker should review the specific polymer architecture and composition before import.