Caustic Calcined Magnesia Powder
Caustic calcined magnesia is magnesium oxide produced by low-temperature calcination of magnesite, resulting in a reactive powder used in chemical and fertilizer industries. It falls under HTS 2519.90.50.00 as 'other magnesium oxide, whether or not pure,' distinct from fused or dead-burned varieties due to its calcination process and reactivity.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If chemically precipitated or of synthetic origin
Synthetic magnesium oxide falls under Chapter 28 as inorganic chemicals, not natural mineral products of Chapter 25.
If dead-burned (sintered) magnesia
Sintered magnesia is specifically classified under 2520.20, differentiated by high-temperature processing for refractoriness.
If prepared as dolomite ramming mix
Mixtures like dolomite ramming mix with magnesium oxide are excluded from Chapter 25 and classified under heading 3816.
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Import Tips & Compliance
• Verify purity and calcination method via lab analysis to confirm classification under 2519.90 as 'other magnesium oxide' rather than fused or dead-burned
• Include certificates of analysis showing magnesium oxide content and absence of sintering to avoid reclassification
• Check for additives; small quantities of other oxides are allowed if added before sintering, but document to prevent disputes
Related Products under HTS 2519.90.50.00
Pharmaceutical Grade Magnesium Oxide USP
Light magnesium oxide meeting USP standards for use as an antacid and laxative in pharmaceuticals. Classified under HTS 2519.90.50.00 as other magnesium oxide, provided it derives from natural sources and is not a finished medicament.
Technical Grade Magnesium Oxide for Fertilizers
Technical magnesia powder used as a magnesium supplement in agricultural fertilizers. It qualifies under HTS 2519.90.50.00 as other magnesium oxide from natural sources, not chemically modified beyond calcination.
Reactive Magnesium Oxide for Water Treatment
Highly reactive light-burned magnesia used for pH adjustment and softening in water treatment plants. Falls under HTS 2519.90.50.00 as other magnesium oxide due to its natural origin and low-temperature processing.
Periclase Magnesium Oxide Crystals
Natural periclase crystals, consisting of nearly pure magnesium oxide, used in research and refractories. Classified in HTS 2519.90.50.00 as other magnesium oxide, whether or not pure, from mineral sources.
Animal Feed Grade Magnesium Oxide
Coarse magnesium oxide powder formulated for livestock mineral supplements to prevent grass tetany. HTS 2519.90.50.00 applies as other magnesium oxide suitable for feed but imported in bulk.
Dunite-Derived Magnesium Oxide
Magnesium oxide calcined from dunite rock (olivine), used in steelmaking and refractories. Classified under HTS 2519.90.50.00 as other magnesium oxide from natural mineral sources.