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HSChapter 39
U.S. imports of polysulfides, polysulfones & other synthetic polymers (nesoi) in primary forms (HS 391190) totaled $36.7M in April 2026, traded with 29 countries.
Importers of Polysulfides, Polysulfones & Other Synthetic Polymers (NESOI) in Primary Forms paid $2.4M in duties in April 2026 — an effective duty rate of 8.7% on $27.8M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 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.
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.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 3911902500 | POLYSULFIDES,POLYSULFONES,ETC,AROM MONO,THERMOPLAS | $14.7M | 6.90% | $874K |
| 3911909150 | POLYSULFIDES,POLYSULFONES,ETC,NESOI,THERMOSETTING | $10.5M | 9.55% | $781K |
| 3911904500 | POLYSULFIDES,POLYSULFONES,ETC,AROM MONO,THERMOSETT | $5.4M | 16.15% | $331K |
| 3911909110 | POLYSULFIDES,POLYSULFONES,ETC,NESOI,THERMOPLASTIC | $4.7M | 6.51% | $254K |
| 3911901500 | THERMOPLASTIC:POLY(NITRILOMETHANE-TETRAARYLNITRILO | $388K | 9.91% | $23K |
| 3911901000 | OTHER ELASTOMERIC RESINS NESOI | $379K | 27.45% | $102K |
| 3911907000 | CHLORINATED SYNTHETIC RUBBER | $373K | 10.00% | $37K |
| 3911903500 | THERMOSETTING: 1,1'BIS(METHYLENDI-4,1-PHENYLENE)-1 | $193K | 10.00% | $5K |
POLYSULFIDES,POLYSULFONES,ETC,AROM MONO,THERMOPLAS
POLYSULFIDES,POLYSULFONES,ETC,NESOI,THERMOSETTING
POLYSULFIDES,POLYSULFONES,ETC,AROM MONO,THERMOSETT
POLYSULFIDES,POLYSULFONES,ETC,NESOI,THERMOPLASTIC
THERMOPLASTIC:POLY(NITRILOMETHANE-TETRAARYLNITRILO
OTHER ELASTOMERIC RESINS NESOI
CHLORINATED SYNTHETIC RUBBER
THERMOSETTING: 1,1'BIS(METHYLENDI-4,1-PHENYLENE)-1
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3911906100 | POLYSULFIDES,POLYSULFONES, & OTH PROD, NESOI | $73.8M |
| 3911901000 | OTHER ELASTOMERIC RESINS NESOI | $3.1M |
POLYSULFIDES,POLYSULFONES, & OTH PROD, NESOI
8.9M kg
OTHER ELASTOMERIC RESINS NESOI
840.6K kg
PLATES, SHEETS ETC, NON-CELL ETC, POLYMER
HS 392010
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NORFOLK-NEWPORT NEWS, VA | $6.0M | $12.7M | +$6.8M |
| LOS ANGELES, CA | $3.7M | $12.4M | +$8.7M |
| CHESTER, PA | $3.5M | $8.9M | +$5.4M |