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HSChapter 40
U.S. imports of unvulcanized rubber compounded with carbon black or silica (HS 400510) totaled $35.8M in April 2026, traded with 26 countries.
Last updated: April 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
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.
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Monthly import values over time