HS 251990

Fused Magnesia, Dead-Burned Magnesia & Other Magnesium Oxides

U.S. imports of fused magnesia, dead-burned magnesia & other magnesium oxides (HS 251990) totaled $12.1M in April 2026, traded with 20 countries.

Last updated: April 2026 data

Processing method and purity grade define the three tariff lines within this heading: fused and dead-burned (sintered) magnesia (2519901000) for high-performance refractory applications, caustic-calcined magnesite (2519902000) for chemical and agricultural uses, and other magnesium oxides (2519905000) for industrial and pharmaceutical-grade applications. Fused magnesia, produced by electric arc melting, commands premium pricing for its exceptional density and thermal stability in steelmaking furnace linings. China is the dominant supplier across all three lines, with Canada, Brazil, Israel, and Mexico also among the top sources. Given China's outsized role in global magnesia supply, these products have been subject to trade-remedy scrutiny, and importers should monitor Section 301 applicability by specific tariff line.

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Imports

$12.1M

from 20 countries · YTD: $79.1M

Exports

$3.3M

Deficit of $8.8M (net importer)

Trade balance: deficit of $8.8M (net importer)

YTD: $79.1M imported (April 2026)

353 shipments/month

Top Import Sources

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1CANADA

Import Trend (12 months)

Monthly import values over time

Geographic Breakdown

SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR

HS 250100

$73.0M

PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT

HS 252329

$64.5M

SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL

HS 250300

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Frequently Asked Questions

How do fused magnesia, dead-burned magnesia, and caustic-calcined magnesite differ in their end uses?

Fused magnesia is produced by electric arc melting and offers the highest density and purity, making it preferred for premium refractory bricks and electrical insulation. Dead-burned (sintered) magnesia is kiln-fired at very high temperatures for general refractory linings. Caustic-calcined magnesite is lower-temperature processed, retaining higher reactivity, and is used in fertilizers, animal feed supplements, and chemical manufacturing.

Are magnesia products from China subject to additional trade-remedy tariffs?

Yes, magnesia products of Chinese origin may be subject to Section 301 tariffs depending on the specific 10-digit tariff line. Importers should verify current applicability for each of the three lines under this heading — 2519901000, 2519902000, and 2519905000 — as Section 301 coverage and rates can vary by line and are subject to ongoing review.