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SITCSection 2
U.S. imports of fused magnesia, dead-burned (sintered) magnesia, and other magnesium oxide (SITC 27825) totaled $12.1M in April 2026, traded with 20 countries.
Importers of Fused Magnesia, Dead-Burned (Sintered) Magnesia, and Other Magnesium Oxide 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 (Sintered) Magnesia, and Other Magnesium Oxide imports of $12.1M in April 2026 ran 39% below the year-to-date monthly average of $19.8M.
Last updated: April 2026 dataProcessed magnesia products — fused, dead-burned (sintered), and other forms of magnesium oxide — are high-value refractory and industrial minerals produced by thermally treating magnesite or seawater-derived magnesium hydroxide at extreme temperatures. Fused magnesia, made in electric arc furnaces, achieves the highest purity and density and is preferred for premium steel-ladle and electric-arc-furnace linings; dead-burned magnesia, produced at lower temperatures, is the workhorse grade for basic refractory bricks. Supply of these materials from certain origins is subject to Section 301 tariffs, a factor that has reshaped sourcing strategies for US refractory manufacturers.
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Fused magnesia is produced by melting magnesite in an electric arc furnace, yielding a very high-density, high-purity product with large crystal size — ideal for demanding applications like steel ladle linings. Dead-burned (sintered) magnesia is fired at high but sub-melting temperatures, producing a less dense but still highly refractory material used in basic brick and monolithic refractories. The choice between them depends on the thermal and chemical severity of the end-use environment.
Commercial invoices and certificates of analysis should specify the production method (fused vs. sintered), MgO purity percentage, bulk density, and crystal size where applicable. These parameters not only support classification but are also required by refractory manufacturers to verify product suitability. A licensed customs broker can advise on whether additional documentation is needed for specific origins subject to trade-remedy measures.
Monthly import values over time
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