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HSChapter 28
U.S. exports of other inorganic compounds; phosphides, gallium arsenide wafers, and amalgams (HS 285390) totaled $9.5M in July 2026.
Importers of Other Inorganic Compounds; Phosphides, Gallium Arsenide Wafers, and Amalgams paid $104K in duties in July 2026 — an effective duty rate of 5.5% on $1.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Other Inorganic Compounds; Phosphides, Gallium Arsenide Wafers, and Amalgams imports of $3.8M in July 2026 ran 43% below the year-to-date monthly average of $6.6M.
Last updated: July 2026 dataGallium arsenide (GaAs) wafers — classified at 2853909010 — are the commercially high-profile item in this residual heading, serving as substrates for compound semiconductors used in RF devices, solar cells, and LEDs. Copper phosphides (2853901000) and other metal phosphides (2853905000) serve as deoxidizing agents and specialty chemical intermediates. Canada and Germany are the leading US suppliers across this heading, with South Korea and Japan also significant. The presence of GaAs wafers makes this heading strategically sensitive: supply-chain concentration and semiconductor-sector demand cycles are key considerations for procurement teams.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
174 shipments/mo
Undoped GaAs wafers are specifically called out at 2853909010. Once a wafer is intentionally doped (e.g., with silicon or zinc to create n-type or p-type material), it may shift classification to Chapter 38 (semiconductor-grade materials) or remain in Chapter 28 depending on the degree of processing and applicable chapter notes. CBP has issued rulings on this distinction, and importers of doped wafers should seek a binding ruling if classification is uncertain.
Copper phosphides containing more than 15% phosphorus by weight (2853901000) are primarily used as deoxidizing master alloys in copper and bronze casting. They are a niche but essential input for foundries and electrical conductor manufacturers. Import volumes tend to track copper alloy production cycles rather than semiconductor demand.
Subheading 1 of 2 in heading 2853
Subheading 285390 · $3.8M of $3.8M
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Exports · July 2026
destination
customs district
origin
entry
rate provision · imports
50.2% enters free of duty; the effective duty rate is 2.73%.
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 |
|---|---|---|---|---|---|
| 2853909090 | Other Phosphides, Excluding Ferrosphorus, NESOI | $3.5M | 2.56% | 48.19% | $90K |
| 2853905000 | Phosphide, Exc Ferrophosphorus, Of Metal/Nonmetals | $172K | 5.18% | 51.82% | $9K |
| 2853901000 | Phosphides of Cu Cont >15% by Weight Phosphorus | $94K | 2.60% | 100.00% | $2K |
| 2853909010 | Gallium Arsenide Wafers, Undoped | $13K | 15.94% | 100.00% | $2K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2853909000 | Inorganic Compounds, Etc, NESOI | $8.0M |
| 2853905000 | Phosphide, Exc Ferrophosphorus, Of Metal/Nonmetals | $1.3M |
| 2853901000 | Phosphides of Cu Cont >15% by Weight Phosphorus | $123K |
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.
ImportsExports
Imports
$3.8MYoY · Pro
Exports
$9.5MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.