Hydrated Magnesium Oxide Powder
Partially hydrated form of magnesium oxide (MgO·H2O) used in rubber compounding and flame retardants. Still classified as magnesium oxide under HTS 2519.90.50.00 when from natural calcined sources.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If fully converted to magnesium hydroxide
Magnesium hydroxide (brucite) has separate chemical classification in 2816.
If synthetic hydrated magnesium oxide
Precipitated hydrated forms are inorganic chemicals of Chapter 28.
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Import Tips & Compliance
• LOI (loss on ignition) tests prove hydration level but maintain MgO classification
• Avoid 'magnesium hydroxide' labeling; classify by chemical identity as oxide
• Specify natural vs. precipitated hydration process
Related Products under HTS 2519.90.50.00
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.
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.