U.S. imports of Polyisobutylene in Primary Forms (HS 390220) totaled $11.6M in August 2026, imported from 18 countries.
Importers of Polyisobutylene in Primary Forms paid $1.9M in duties in August 2026, an average duty rate of 16.59% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Polyisobutylene in Primary Forms imports of $11.6M in August 2026 ran 38% above the year-to-date monthly average of $8.4M.
Last updated: August 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.
233 import shipments a month
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.
ImportsExports
Imports
$11.6MYoY · free account
Exports
$12.9MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $92.2M of Polyisobutylene in Primary Forms and exported $125.2M.
Through August 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 | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3902205000 | Polyisobutylene, NESOI | $11.2M | 15.99% | 90.87% | $1.8M |
| 3902201000 | Polyisobutylene, Elastomeric | $404K | 33.25% | 100.00% | $134K |
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 | $12.0M |
| 3902201000 | Polyisobutylene, Elastomeric | $907K |
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.
Trade Directory
List your company under HS 390220 — Polyisobutylene in Primary Forms, so the companies trading it can find you. Be the first supplier listed.
Subheading 4 of 4 in heading 3902
Subheading 390220 · $11.6M of $100.4M
Imports · August 2026
origin
Germany and France together supply 41% of it. Brazil pays 44.0% duty; France 10.0%.
customs district
destination
entry
rate provision · imports
8.8% enters free of duty; duty collected equals 16.59% of imports for consumption.