Loading...
HSChapter 39
U.S. imports of polyisobutylene in primary forms (HS 390220) totaled $12.8M in July 2026, traded with 18 countries.
Importers of Polyisobutylene in Primary Forms paid $2.3M in duties in July 2026 — an effective duty rate of 19% on $12.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Polyisobutylene in Primary Forms imports of $12.8M in July 2026 ran 60% above the year-to-date monthly average of $7.9M.
Last updated: July 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.
261 shipments/mo
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.
Supplier Network
Get discovered by U.S. importers searching for HS 390220 — Polyisobutylene in Primary Forms. Be the first supplier listed.
Subheading 4 of 4 in heading 3902
Subheading 390220 · $12.8M of $91.0M
ImportsExports
Imports
$12.8MYoY · Pro
Exports
$7.1MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
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 |
|---|---|---|---|---|---|
| 3902205000 | Polyisobutylene,NESOI | $12.3M | 17.93% | 98.86% | $2.2M |
| 3902201000 | Polyisobutylene,Elastomeric | $446K | 30.50% | 100.00% | $136K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3902205000 | Polyisobutylene,NESOI | $6.3M |
| 3902201000 | Polyisobutylene,Elastomeric | $816K |
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.
Imports · July 2026
origin
France and Germany together supply 52% of it.
customs district
destination
entry
rate provision · imports
1.1% enters free of duty; the effective duty rate is 18.37%.