U.S. exports of Isoprene Rubber (IR) — Primary Forms, Plates, Sheets & Strip (HS 400260) totaled $9.7M in August 2026.
Importers of Isoprene Rubber (IR) — Primary Forms, Plates, Sheets & Strip paid $126K in duties in August 2026, an average duty rate of 12.77% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Isoprene Rubber (IR) — Primary Forms, Plates, Sheets & Strip imports of $988K in August 2026 ran 38% below the year-to-date monthly average of $1.6M.
Last updated: August 2026 dataSynthetic isoprene rubber closely mimics the molecular structure of natural rubber and serves as a drop-in substitute in tire manufacturing, medical devices, and high-performance adhesives where consistent purity and controlled Mooney viscosity are required. Japan is the leading US supplier, with Russia a significant second source — a supply-chain concentration that has drawn increased scrutiny from procurement teams managing geopolitical risk. All imports fall under tariff line 4002600000.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
15 import shipments a month
Natural rubber (NR) is classified under HTS heading 4001, while synthetic isoprene rubber (IR) falls under heading 4002. Although IR replicates the cis-1,4-polyisoprene structure of NR, it is produced by polymerization of petrochemical isoprene monomer. For classification, the key distinction is origin — biological versus synthetic — not chemical structure. Buyers substituting IR for NR should update their HTS declarations accordingly.
Russia has historically been a major global producer of synthetic isoprene rubber. Importers relying on Russian-origin IR should monitor applicable US sanctions, export controls, and any trade-remedy measures that may affect admissibility or duty treatment. Diversifying to Japan or other suppliers is a risk-mitigation strategy that procurement teams have increasingly evaluated.
Subheading 7 of 14 in heading 4002
Subheading 400260 · $9.7M of $240.3M
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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 |
|---|---|---|---|---|---|
| 4002600000 | Isoprene Rubber (Ir) | $988K | 12.77% | 71.57% | $126K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 4002600000 | Isoprene Rubber (Ir) | $9.7M |
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.
Exports · August 2026
destination
customs district
origin
entry
rate provision · imports
28.4% enters free of duty; duty collected equals 12.77% of imports for consumption.
ImportsExports
Imports
$988KYoY · free account
Exports
$9.7MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $20.8M of Isoprene Rubber (IR) — Primary Forms, Plates, Sheets & Strip and exported $96.8M.
Through August 2026. Source: U.S. Census Bureau.