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U.S. exports of polysulfides, polysulfones & other synthetic polymers (nesoi) in primary forms (HS 391190) totaled $84.2M in July 2026.
Importers of Polysulfides, Polysulfones & Other Synthetic Polymers (NESOI) in Primary Forms paid $2.9M in duties in July 2026 — an effective duty rate of 9.7% on $29.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataPolyphenylene sulfide (PPS), polyethersulfone (PES), and related high-performance thermoplastics and elastomers in this residual heading serve demanding applications in aerospace, automotive under-hood components, and semiconductor processing equipment. The US schedule subdivides the heading into nine 10-digit lines distinguishing thermoplastic from thermosetting forms, aromatic monomer content, elastomeric resins, and chlorinated synthetic rubber — distinctions that carry different duty rates and Section 301 exposure for Chinese-origin goods. Germany and Japan lead US supply, reflecting the dominance of specialty chemical producers such as those in the BASF and Toray ecosystems.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
1.0K shipments/mo
The classification turns on the polymer's behavior under heat: thermoplastics (e.g., standard PES or PPSU) re-melt and are classified under lines such as 3911902500 or 3911909110, while thermosets that irreversibly cure are directed to lines such as 3911904500 or 3911909150. The supplier's technical data sheet specifying processing temperature behavior and cure chemistry is the primary supporting document.
Yes — the US schedule provides a dedicated 10-digit line (3911907000) for chlorinated synthetic rubber, distinguishing it from the polysulfide and polysulfone lines. Importers should verify that the product meets the chemical definition of chlorinated rubber rather than a chlorinated polyolefin, which could fall under a different chapter entirely.
HSChapter 39
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Subheading 1 of 3 in heading 3911
Subheading 391190 · $41.1M of $56.1M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3911902500 | Polysulfides,Polysulfones,Etc,Arom Mono,Thermoplas | $16.3M | 6.29% | 78.30% | $1.0M |
| 3911909150 | Polysulfides,Polysulfones,Etc,NESOI,Thermosetting | $11.7M | 8.26% | 74.30% | $970K |
| 3911904500 | Polysulfides,Polysulfones,Etc,Arom Mono,Thermosett | $6.1M | 5.67% | 36.85% | $344K |
| 3911909110 | Polysulfides,Polysulfones,Etc,NESOI,Thermoplastic | $6.0M | 7.33% | 87.91% | $442K |
| 3911901000 | Other Elastomeric Resins NESOI | $399K | 14.29% | 86.45% | $57K |
| 3911901500 | Thermoplastic:poly(Nitrilomethane-Tetraarylnitrilo | $351K | 5.19% | 51.16% | $18K |
| 3911903500 | Thermosetting: 1,1'bis(Methylendi-4,1-Phenylene)-1 | $185K | 0.32% | 3.20% | $593 |
| 3911907000 | Chlorinated Synthetic Rubber | $73K | 10.51% | 100.00% | $8K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3911906100 | Polysulfides,Polysulfones, & Oth Prod, NESOI | $81.0M |
| 3911901000 | Other Elastomeric Resins NESOI | $3.2M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$41.1MYoY · Pro
Exports
$84.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
customs district
origin
entry
rate provision · imports
28.0% enters free of duty; the effective duty rate is 6.96%.