HS Code for Magnesium hydroxide

Magnesium hydroxide is classified under HS code 2816.10, which covers the hydroxide and peroxide of magnesium. This classification is part of Chapter 28, which encompasses inorganic chemicals and precious metal compounds. Heading 2816 is specifically structured to include the hydroxides and peroxides of magnesium, strontium, and barium. Magnesium hydroxide, often found in the form of a white powder or as "milk of magnesia" in aqueous suspension (provided it is not prepared as a medicament), is the primary product under this subheading. The classification process involves distinguishing the hydroxide from the oxide. Magnesium oxide (magnesia) is classified under 2816.40 if it is pure, or under 2519 if it is natural or calcined magnesite. Magnesium hydroxide is typically produced by the hydration of reactive magnesium oxide or by the reaction of magnesium salts with an alkali. It is widely used in industrial applications as a flame retardant, in environmental applications for wastewater treatment, and in the pharmaceutical industry as an antacid or laxative. The purity and the chemical structure (Mg(OH)2) are the deciding factors for this code.

Products Included

• Pure magnesium hydroxide powder
• Magnesium peroxide
• Aqueous suspensions of magnesium hydroxide (non-medicinal)
• Technical grade magnesium hydroxide for flame retardants
• Synthetic brucite (magnesium hydroxide)

Common Misclassification

Magnesium hydroxide is frequently confused with magnesium oxide, which is classified under 2816.40 (if pure) or 2519 (if natural/calcined). Another common misclassification is 3004.90, which applies if the magnesium hydroxide is prepared as a medicine (e.g., flavored antacid tablets or liquids for retail sale). It is also important to distinguish it from natural brucite, which is classified under 2519.90 unless it is in the form of a pure chemical.

FAQ

What is the HS code for magnesium hydroxide?

The HS code for magnesium hydroxide and magnesium peroxide is 2816.10.

Is milk of magnesia classified under this code?

Yes, if it is a simple aqueous suspension of magnesium hydroxide. If it contains flavoring, sweeteners, or is packaged as a retail medicament, it moves to 3004.