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HSChapter 38
U.S. exports of prepared rubber accelerators (HS 381210) totaled $5.6M in July 2026.
Importers of Prepared Rubber Accelerators paid $572K in duties in July 2026 — an effective duty rate of 24% on $2.3M in dutiable value, based on actual customs collections rather than the published tariff schedule. Prepared Rubber Accelerators imports of $2.4M in July 2026 ran 19% above the year-to-date monthly average of $2.0M.
Last updated: July 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.
82 shipments/mo
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.
Subheading 4 of 4 in heading 3812
Subheading 381210 · $2.4M of $48.6M
ImportsExports
Imports
$2.4MYoY · Pro
Exports
$5.6MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3812105000 | Prepared Rubber Accelerators, NESOI | $1.4M | 22.24% | 99.78% | $320K |
| 3812101000 | Prep Rubber Accelerators Cont Aromtic/Modified Etc | $914K | 27.61% | 100.00% | $252K |
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 | $5.6M |
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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Exports · July 2026
destination
China and Mexico together take 42% of it.
customs district
origin
entry
rate provision · imports
0.1% enters free of duty; the effective duty rate is 24.33%.