Fused Magnesia, Dead-Burned Magnesia & Other Magnesium Oxides

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.