U.S. imports of Unvulcanized Rubber Compounded with Carbon Black or Silica (HS 400510) totaled $44.1M in August 2026, imported from 33 countries.
Importers of Unvulcanized Rubber Compounded with Carbon Black or Silica paid $2.3M in duties in August 2026, an average duty rate of 5.25% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Unvulcanized Rubber Compounded with Carbon Black or Silica imports of $44.1M in August 2026 ran 17% above the year-to-date monthly average of $37.7M.
Last updated: August 2026 dataCarbon-black- and silica-compounded unvulcanized rubber—classified entirely under 4005100000—is a primary feedstock for tire manufacturing and industrial rubber goods, where the filler loading directly governs tensile strength and abrasion resistance. Thailand and Malaysia, the world's dominant natural-rubber processors, are key origins alongside Canada and Germany, reflecting both natural-rubber compounding capacity and synthetic-rubber blending expertise. Importers sourcing from Thailand or Malaysia should note that these shipments do not automatically qualify for US free-trade-agreement preference rates.
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2.0K import shipments a month
Heading 400510 covers the compound in primary forms (bales, pellets, granules) as well as in plates, sheets, or strip. Form does not change the classification within this heading, but if the rubber has been further shaped into finished articles, it would move to a different chapter 40 heading.
There is no minimum filler percentage specified in the tariff schedule; the key requirement is that carbon black or silica is the predominant compounding agent. Importers typically rely on the supplier's material safety data sheet or technical data sheet to document the compound composition for CBP entry purposes.
Subheading 1 of 4 in heading 4005
Subheading 400510 · $44.1M of $59.7M
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 |
|---|---|---|---|---|---|
| 4005100000 | Rub, Unvulcanized, Compound W/ Carbon Blk/Silica | $44.1M | 5.25% | 41.36% | $2.3M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 4005100000 | Rub, Unvulcanized, Compound W/ Carbon Blk/Silica | $44.8M |
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.
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Imports · August 2026
origin
Canada and Thailand together supply 74% of it. Brazil pays 37.5% duty; Mexico <0.1%.
customs district
destination
entry
rate provision · imports
58.6% enters free of duty; duty collected equals 5.25% of imports for consumption.
ImportsExports
Imports
$44.1MYoY · free account
Exports
$44.8MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $456.5M of Unvulcanized Rubber Compounded with Carbon Black or Silica and exported $495.3M.
Through August 2026. Source: U.S. Census Bureau.