U.S. exports of Unvulcanized Compounded Rubber in Primary Forms (NESOI) (HS 400599) totaled $16.2M in August 2026.
Importers of Unvulcanized Compounded Rubber in Primary Forms (NESOI) paid $380K in duties in August 2026, an average duty rate of 10.55% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Unvulcanized Compounded Rubber in Primary Forms (NESOI) imports of $3.6M in August 2026 ran 21% above the year-to-date monthly average of $3.0M.
Last updated: August 2026 dataCompounded unvulcanized rubber in primary forms—bales, pellets, crumbs, and similar bulk shapes—that do not fit the more specific carbon-black, silica, solution, or dispersion headings classifies under 4005990000. South Korea and Turkey are the leading US suppliers, reflecting significant synthetic-rubber compounding capacity in both countries, with Italy, Germany, and the United Kingdom also active. The breadth of the NESOI designation means classification disputes are common when compound formulations straddle multiple headings, making supplier documentation critical.
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76 import shipments a month
Importers should obtain a technical data sheet or certificate of analysis specifying the compound's filler type, polymer base, and physical form. If carbon black or silica is the primary filler, the goods belong under 400510; if the material is in solution or dispersion, it belongs under 400520. Only compounds that genuinely fall outside those descriptions should be entered under 4005990000.
South Korea is a US free-trade-agreement partner under KORUS, so qualifying originating goods may be eligible for reduced or zero duty rates. Importers must obtain a valid certificate of origin or equivalent documentation and confirm the goods meet KORUS rules-of-origin requirements to claim the preference.
Subheading 2 of 4 in heading 4005
Subheading 400599 · $16.2M of $73.2M
ImportsExports
Imports
$3.6MYoY · free account
Exports
$16.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $32.0M of Unvulcanized Compounded Rubber in Primary Forms (NESOI) and exported $168.0M.
Through August 2026. Source: U.S. Census Bureau.
Trade Directory
List your company under HS 400599 — Unvulcanized Compounded Rubber in Primary Forms (NESOI), so the companies trading it can find you. Be the first supplier listed.
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 |
|---|---|---|---|---|---|
| 4005990000 | Compound Rub, Unvulcanized, In Primary Form, NESOI | $3.6M | 10.55% | 89.79% | $380K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 4005990000 | Compound Rub, Unvulcanized, In Primary Form, NESOI | $16.2M |
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
Mexico and China together take 46% of it.
customs district
origin
entry
rate provision · imports
10.2% enters free of duty; duty collected equals 10.55% of imports for consumption.