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HSChapter 39
U.S. imports of polyisobutylene in primary forms (HS 390220) totaled $6.5M in April 2026, traded with 14 countries.
Importers of Polyisobutylene in Primary Forms paid $930K in duties in April 2026 — an effective duty rate of 15% on $6.4M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataPolyisobutylene (PIB) in primary forms is classified by its rheological behavior: the elastomeric grade (3902201000) — a high-molecular-weight, rubbery material — is used in butyl rubber compounding, sealants, and pharmaceutical stoppers, while the non-elastomeric NESOI grade (3902205000) covers lower-molecular-weight viscous liquids used as lubricant additives, adhesive tackifiers, and fuel additives. South Korea and Germany are the leading US suppliers, reflecting the concentration of global PIB production capacity in those markets. Importers should confirm molecular weight range and viscosity data, as these parameters drive both end-use suitability and the elastomeric vs. non-elastomeric classification split.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
CBP applies the Chapter 39 elastomeric definition: the material must stretch to at least twice its original length and recover substantially. High-molecular-weight PIB (typically above ~100,000 g/mol) generally meets this test; lower-molecular-weight grades do not. Importers should obtain a certificate of analysis with number-average or weight-average molecular weight and, where possible, a stress-strain test result to support the chosen classification.
As of the most recent publicly available information, polyisobutylene from South Korea and Germany is not subject to antidumping or countervailing duty orders specific to this product. However, importers should conduct a current AD/CVD order search with CBP or USITC before entry, as trade-remedy landscapes can change.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| FRANCE | $908K | $2.2M | +$1.3M |
| KOREA, SOUTH | $1.9M | $38K | -$1.8M |
| INDIA | -- | $1.8M | +$1.8M |
| GERMANY | $1.6M | -- | -$1.6M |
| ARGENTINA | $1.1M | -- | -$1.1M |
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 |
|---|---|---|---|---|
| 3902205000 | POLYISOBUTYLENE,NESOI | $6.4M | 14.64% | $925K |
| 3902201000 | POLYISOBUTYLENE,ELASTOMERIC | $50K | 10.00% | $5K |
POLYISOBUTYLENE,NESOI
POLYISOBUTYLENE,ELASTOMERIC
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3902205000 | POLYISOBUTYLENE,NESOI | $6.7M |
| 3902201000 | POLYISOBUTYLENE,ELASTOMERIC | $720K |
POLYISOBUTYLENE,NESOI
2.5M kg
POLYISOBUTYLENE,ELASTOMERIC
401.2K kg
ARTICLES OF PLASTICS, NESOI
HS 392690
FLOOR, WALL, ETC COVERS, VINYL CHLORIDE POLYMERS
HS 391810
TABLEWARE AND KITCHENWARE OF PLASTICS
HS 392410
SACKS & BAGS (INCL CONES) OF POLYMERS OF ETHYLENE
HS 392321
HOUSEHOLD AND TOILET ARTICLES NESOI OF PLASTICS
HS 392490
PLATES, SHEETS ETC, NON-CELL ETC, POLYMER
HS 392010
| Port | Imports | Exports | Balance |
|---|---|---|---|
| HOUSTON, TX | $3.1M | $5.1M | +$2.0M |
| NEWARK, NJ | $935K | $70K | -$865K |
| NORFOLK-NEWPORT NEWS, VA | $923K | $6K | -$916K |