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HSChapter 28
U.S. imports of silicon (less than 99.99% purity) — metallurgical & intermediate grades (HS 280469) totaled $48.0M in April 2026, traded with 16 countries.
Importers of Silicon (Less Than 99.99% Purity) — Metallurgical & Intermediate Grades paid $5.6M in duties in April 2026 — an effective duty rate of 15% on $38.3M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataMetallurgical-grade and intermediate-purity silicon — silicon containing less than 99.99% silicon by weight — is the workhorse input for aluminum alloys, silicones, and chemical intermediates, and is classified under heading 280469. The US schedule further subdivides this heading: 2804691000 covers silicon between 99% and 99.99% pure, while 2804695000 covers silicon below 99% purity, a distinction that matters for both duty treatment and end-use qualification. Brazil and Canada are the leading US suppliers, with Norway and Australia also significant — a supplier mix shaped by access to low-cost hydroelectric power, which is the dominant production cost driver for electric-arc-furnace silicon smelting. Imports from certain origins may be subject to antidumping or countervailing duty orders, so a thorough admissibility review is advisable before sourcing.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Line 2804691000 covers silicon that is between 99% and 99.99% pure by weight — sometimes called 'solar-precursor' or 'upgraded metallurgical' grade — while 2804695000 covers silicon below 99% purity, the standard metallurgical grade used in aluminum alloys and silicone chemistry. The purity boundary directly affects duty treatment and may affect eligibility under certain trade-remedy orders.
Antidumping and countervailing duty orders have historically applied to silicon metal from several countries. Importers should query the CBP ADD/CVD portal and USITC records for the current status of any orders covering their specific origin country and purity grade before committing to a purchase.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2804691000 | SILICON BETWEEN 99.99 PERCENT AND 99 PERCENT PURE | $43.0M | 15.30% | $5.1M |
| 2804695000 | SILICON LESS THAN 99 PERCENT PURE | $5.0M | 9.18% | $448K |
SILICON BETWEEN 99.99 PERCENT AND 99 PERCENT PURE
SILICON LESS THAN 99 PERCENT PURE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2804695000 | SILICON LESS THAN 99 PERCENT PURE | $3.2M |
| 2804691000 | SILICON BETWEEN 99.99 PERCENT AND 99 PERCENT PURE | $409K |
SILICON LESS THAN 99 PERCENT PURE
501.1K kg
SILICON BETWEEN 99.99 PERCENT AND 99 PERCENT PURE
291.7K kg
URANIUM ENRICHED IN U235 ETC. PLUTONIUM ETC.
HS 284420
NATURAL URANIUM & COMPOUNDS, ALLOYS & CERAMICS ETC
HS 284410
ANHYDROUS AMMONIA
HS 281410
ALLOYS, DISPERSIONS,ISOTOPES & COMPOUNDS NES
HS 284443
PHOSPHORIC ACID AND POLYPHOSPHORIC ACIDS
HS 280920
SULFURIC ACID; OLEUM
HS 280700
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEW ORLEANS, LA | $28.9M | $23K | -$28.8M |
| PORT HURON, MI | $8.9M | $22K | -$8.8M |
| BALTIMORE, MD | $3.3M | -- | -$3.3M |