HS code · 6-digit subheading
HS Code 2519.90 – Magnesia, fused or dead-burned (sintered); whether or not containing small quantities of other oxides added before sintering, other magnesium oxide, whether or not pure, (not natural magnesium carbonate)
HS code 2519.90 is the 6-digit subheading for magnesia, fused or dead-burned (sintered), whether or not containing small quantities of other oxides added before sintering, other magnesium oxide, whether or not pure, (not natural magnesium carbonate). It is used for fused magnesia, dead-burned magnesia, sintered magnesia, high-purity magnesium oxide and electrical-grade magnesia.
What HS 2519.90 covers
This HS code encompasses various forms of processed magnesium oxide (magnesia), specifically fused or dead-burned (sintered) magnesia, and other pure or impure magnesium oxides, excluding natural magnesium carbonate. This category represents highly refined and thermally treated magnesium products, crucial for high-performance industrial applications. Major importers are countries with advanced metallurgical, refractory, and electrical industries, as these forms of magnesia are essential for manufacturing high-temperature resistant materials, electrical insulators, and specialized ceramics. Exporters are typically nations with the technological capability for advanced mineral processing, often converting raw magnesite or magnesium hydroxide into these high-value forms. Key considerations in trade include the purity level, crystal size, density, and specific properties like electrical resistivity or thermal conductivity, which dictate their suitability for demanding applications. This code signifies a significant value-added product in the magnesium supply chain.
- Covers
- Fused magnesia
- Dead-burned magnesia
- Sintered magnesia
- High-purity magnesium oxide
- Electrical-grade magnesia
- Refractory magnesia
- Caustic calcined magnesia
- Examples
- RHI Magnesita Fused Magnesia
- Vesuvius Dead-Burned Magnesia
- Magnezit Group Sintered Magnesia
- Martin Marietta Magnesia Specialties
Codes often confused with 2519.90
Common mistake. This code is frequently confused with 251910 (natural magnesium carbonate/magnesite) because both are magnesium-based, but 251990 covers processed oxides, not the raw carbonate. It might also be mistaken for certain calcined dolomite products (251820) if the magnesium oxide content is the primary focus, but 251990 is specifically magnesium oxide.
Top exporters and importers of HS code 251990, 2025
In 2025, the largest exporter of HS code 251990 in UN Comtrade data was China, with 47% of world exports; the largest importer in UN Comtrade data was the United States, with 13% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 China $860M 47% of world exports
- 2 Netherlands $142M 7.9% of world exports
- 3 Brazil $99M 5.5% of world exports
World total: $1.8B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $266M 13% of world imports
- 2 India $193M 9.2% of world imports
- 3 Germany $183M 8.7% of world imports
World total: $2.1B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for 2519.90 2
Brazil splits HS 2519.90 into 2 NCM codes, Mercosur's 8-digit tariff lines.
- 2519.90.10 Fused (electrofused) magnesiaMagnésia eletrofundida
- 2519.90.90 Dead-burned magnesia and other magnesium oxideOutros
All Brazil NCM codes in heading 25.19 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 2519.90
What is HS code 251990?
HS code 251990 is a 6-digit subheading in the Harmonized System that covers: Magnesia, fused or dead-burned (sintered); whether or not containing small quantities of other oxides added before sintering, other magnesium oxide, whether or not pure, (not natural magnesium carbonate). This HS code encompasses various forms of processed magnesium oxide (magnesia), specifically fused or dead-burned (sintered) magnesia, and other pure or impure magnesium oxides, excluding natural magnesium carbonate. This category represents highly refined and thermally treated magnesium products, crucial for high-performance industrial applications. Major importers are countries with advanced metallurgical, refractory, and electrical industries, as these forms of magnesia are essential for manufacturing high-temperature resistant materials, electrical insulators, and specialized ceramics. Exporters are typically nations with the technological capability for advanced mineral processing, often converting raw magnesite or magnesium hydroxide into these high-value forms. Key considerations in trade include the purity level, crystal size, density, and specific properties like electrical resistivity or thermal conductivity, which dictate their suitability for demanding applications. This code signifies a significant value-added product in the magnesium supply chain.
What products fall under HS code 251990?
Fused magnesia, Dead-burned magnesia, Sintered magnesia, High-purity magnesium oxide, Electrical-grade magnesia, Refractory magnesia, Caustic calcined magnesia
What are common misclassifications for HS code 251990?
This code is frequently confused with 251910 (natural magnesium carbonate/magnesite) because both are magnesium-based, but 251990 covers processed oxides, not the raw carbonate. It might also be mistaken for certain calcined dolomite products (251820) if the magnesium oxide content is the primary focus, but 251990 is specifically magnesium oxide.
Which countries are the top exporters of goods under HS code 251990?
In 2025, the top exporters of HS code 251990 in UN Comtrade data were China ($860M, 47% of world exports), the Netherlands ($142M) and Brazil ($99M). World exports came to about $1.8B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 251990?
In 2025, the top importers of HS code 251990 in UN Comtrade data were the United States ($266M, 13% of world imports), India ($193M) and Germany ($183M). World imports came to about $2.1B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 251990 structured?
HS code 251990 is a 6-digit subheading under the Harmonized System. The first 2 digits (25) identify the chapter, digits 3-4 (19) identify the heading, and digits 5-6 (90) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 251990?
Brazil splits HS code 251990 into 2 NCM codes: 2519.90.10 (Fused (electrofused) magnesia), 2519.90.90 (Dead-burned magnesia and other magnesium oxide). The first 6 digits of each match the HS code.