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SITCSection 2
U.S. imports of dolomite (calcined or not), including rough shapes and agglomerated dolomite (SITC 27823) totaled $2.0M in April 2026, traded with 6 countries.
Importers of Dolomite (Calcined or Not), Including Rough Shapes and Agglomerated Dolomite paid $85K in duties in April 2026 — an effective duty rate of 10% on $847K in dutiable value, based on actual customs collections rather than the published tariff schedule. Dolomite (Calcined or Not), Including Rough Shapes and Agglomerated Dolomite imports of $2.0M in April 2026 ran 15% above the year-to-date monthly average of $1.8M.
Last updated: April 2026 dataDolomite — a calcium magnesium carbonate mineral — enters US commerce in several forms: raw crushed rock, roughly trimmed blocks or slabs, calcined (heat-treated) material, and agglomerated product, each serving distinct industrial roles in steelmaking flux, refractory linings, glass manufacturing, and agricultural lime. Calcination fundamentally changes the mineral's reactivity and bulk density, making the thermal treatment state the most commercially significant classification variable. The heading's breadth means that a single supplier may ship multiple product forms under the same code, requiring careful invoice description to avoid misclassification.
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Raw dolomite is primarily used as a construction aggregate, agricultural amendment, or steelmaking flux. Calcined dolomite has been heated to drive off carbon dioxide, producing a more reactive material used in refractory applications and as a sintering agent. The calcined form is denser, more caustic, and commands a different price point, so the thermal treatment state must be clearly stated on commercial invoices.
Dolomite and limestone can appear similar visually, so a chemical analysis certificate confirming the magnesium carbonate content is standard practice. Customs may request mill certificates or laboratory assay reports to verify that the material meets the mineralogical definition of dolomite (typically at least 40% MgCO₃ by weight) rather than calcitic limestone.
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Monthly import values over time