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HSChapter 25
U.S. imports of fused magnesia, dead-burned magnesia & other magnesium oxides (HS 251990) totaled $12.1M in April 2026, traded with 20 countries.
Importers of Fused Magnesia, Dead-Burned Magnesia & Other Magnesium Oxides paid $123K in duties in April 2026 — an effective duty rate of 11% on $1.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Fused Magnesia, Dead-Burned Magnesia & Other Magnesium Oxides imports of $12.1M in April 2026 ran 39% below the year-to-date monthly average of $19.8M.
Last updated: April 2026 dataThermally processed magnesium oxides — including fused magnesia (2519901000), caustic-calcined magnesite (2519902000), and other magnesium oxides (2519905000) — serve distinct industrial roles ranging from high-temperature refractory bricks to agricultural and environmental applications. China is the dominant supplier across all three product types, and imports from China are subject to Section 301 tariffs, a significant landed-cost consideration for US buyers. Canada, Brazil, Israel, and Mexico supply the balance, with Israel notable for high-purity caustic-calcined grades used in environmental and chemical applications. The processing route — fusion temperature, sintering degree, and resulting crystal density — determines which 10-digit line applies and which end-use markets the product serves.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Fused magnesia (2519901000) is produced by melting magnesite in an electric arc furnace, yielding very high density and purity — used in premium refractory applications. Dead-burned (sintered) magnesia is fired at extremely high temperatures (above 1500°C) to produce a dense, low-reactivity product for furnace linings. Caustic-calcined magnesite (2519902000) is fired at lower temperatures, retaining reactivity for agricultural, environmental, and chemical uses. The supplier's certificate of analysis specifying bulk density, LOI, and production method is essential for correct classification.
Imports of magnesium oxide products from China are subject to Section 301 tariffs. Because rates and product coverage under Section 301 can change, importers should verify the current applicable rate for the specific 10-digit HTS line at the time of entry and factor this into total landed cost calculations. Working with a licensed customs broker is advisable given the complexity of Section 301 exclusion requests and modifications.
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2519901000 | MAGNESIA, FUSED AND DEAD-BURNED (SINTERED) | $6.2M | 40.00% | $8K |
| 2519902000 | MAGNESITE, CAUSTIC CALCINED | $4.0M | 10.00% | $2K |
| 2519905000 | MAGNESIUM OXIDES, NESOI | $1.8M | 10.00% | $113K |
MAGNESIA, FUSED AND DEAD-BURNED (SINTERED)
MAGNESITE, CAUSTIC CALCINED
MAGNESIUM OXIDES, NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2519905000 | MAGNESIUM OXIDES, NESOI | $1.8M |
| 2519902000 | MAGNESITE, CAUSTIC CALCINED | $797K |
| 2519901000 | MAGNESIA, FUSED AND DEAD-BURNED (SINTERED) | $723K |
MAGNESIUM OXIDES, NESOI
833.8K kg
MAGNESITE, CAUSTIC CALCINED
642 t
MAGNESIA, FUSED AND DEAD-BURNED (SINTERED)
502.1K kg
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
PEBBLES, GRAVEL ETC. FOR CONCRETE AGGREGATES ETC.
HS 251710
| State | Imports | Exports | Balance |
|---|---|---|---|
| New York | $1.7M | $55K | -$1.6M |
| Connecticut | $1.7M | -- | -$1.7M |
| Michigan | -- | $1.3M | +$1.3M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEWARK, NJ | $2.0M | $30K | -$1.9M |
| LOS ANGELES, CA | $1.3M | $556K | -$750K |
| PORTAL, ND | $1.3M | $105K | -$1.1M |