U.S. imports of Prepared Rubber Accelerators (HS 381210) totaled $2.4M in September 2026, imported from 21 countries.
Importers of Prepared Rubber Accelerators paid $498K in duties in September 2026, an average duty rate of 21.05% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Prepared Rubber Accelerators imports of $2.4M in September 2026 ran 15% above the year-to-date monthly average of $2.1M.
Last updated: September 2026 dataRubber accelerators — sulfenamides, thiurams, dithiocarbamates, and guanidines formulated for use in vulcanization — are a critical processing chemical for tire, hose, and molded rubber goods manufacturing. China dominates US import supply under this heading, and imports from China are subject to Section 301 tariffs, making supply-chain diversification toward Japan, Malaysia, and India a live commercial consideration for rubber goods producers. The US schedule distinguishes accelerators containing aromatic or modified aromatic substances (3812101000) from other prepared accelerators (3812105000), a split that reflects environmental and regulatory attention to certain aromatic amine byproducts generated during vulcanization.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
76 import shipments a month
The distinction under 3812101000 versus 3812105000 tracks the presence of aromatic or modified aromatic ring structures in the accelerator molecule, which is relevant because certain aromatic accelerators — particularly those that can generate nitrosamines or primary aromatic amines during vulcanization — face regulatory scrutiny in major export markets. Correct classification also matters because the two lines may carry different duty rates or Section 301 exposure.
Because China is the dominant supplier and Chinese-origin rubber accelerators are subject to Section 301 tariffs, many US rubber goods manufacturers have been evaluating alternative sources in Japan, Malaysia, and India. However, capacity and product-grade availability outside China remain constraints for certain accelerator chemistries, so importers often weigh tariff cost against supply reliability when making sourcing decisions.
ImportsExports
Imports
$2.4MYoY · free account
Exports
—YoY · free account
12-mo low · imports
Low · free accountOver the twelve months to September 2026, the U.S. imported $23.1M of Prepared Rubber Accelerators.
Through September 2026 · exports 11 of 12 months reported. Source: U.S. Census Bureau.
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Subheading 4 of 4 in heading 3812
Subheading 381210 · $2.4M of $45.3M
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 |
|---|---|---|---|---|---|
| 3812105000 | Prepared Rubber Accelerators, NESOI | $1.3M | 23.81% | 99.61% | $308K |
| 3812101000 | Prep Rubber Accelerators Cont Aromtic/Modified Etc | $1.1M | 21.62% | 100.00% | $240K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3812100000 | Prepared Rubber Accelerators | $4.9M |
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.
Imports · September 2026
origin
China and India together supply 49% of it. China pays 42.9% duty; Netherlands 10.0%.
customs district
destination
entry
rate provision · imports
0.2% enters free of duty; duty collected equals 21.05% of imports for consumption.