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HSChapter 39
U.S. exports of silicones in primary forms (HS 391000) totaled $113.2M in July 2026.
Importers of Silicones in Primary Forms paid $7.1M in duties in July 2026 — an effective duty rate of 15% on $46.7M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataSilicones in primary forms — including polydimethylsiloxane fluids, gums, and resins — serve as foundational intermediates for adhesives, sealants, personal care formulations, and electronics encapsulants. Imports enter under a single 10-digit line (3910000000) and are subject to Section 301 tariffs when sourced from China, making origin tracking critical for cost management. Germany and Japan are the leading suppliers to the US market, with Canada also a significant source; the European and Japanese producers dominate high-purity specialty grades.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
2.7K shipments/mo
Imports of silicones in primary forms originating from China are subject to Section 301 tariffs. Importers sourcing from Germany, Japan, or Canada are not subject to those measures, making supplier origin a key cost variable.
All silicones in primary forms, regardless of viscosity or physical state (fluid, gum, elastomer base, or resin), consolidate into a single US tariff line (3910000000). Classification disputes typically arise when a silicone product has been further processed into a semi-finished article, which may shift it out of Chapter 39 entirely.
Subheading 1 of 1 in heading 3910
Subheading 391000 · $52.0M of $52.0M
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ImportsExports
Imports
$52.0MYoY · Pro
Exports
$113.2MYoY · 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 |
|---|---|---|---|---|---|
| 3910000000 | Silicones in Primary Forms | $52.0M | 13.57% | 89.86% | $7.1M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3910000000 | Silicones in Primary Forms | $113.2M |
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 · July 2026
destination
customs district
origin
entry
rate provision · imports
12.4% enters free of duty; the effective duty rate is 13.57%.