Product classification
HS code for Boron oxide: 2810.00
Oxides of boron, boric acids.
Classification of boron oxide under HS 2810.00
Boron oxide, primarily known as diboron trioxide (B2O3), is classified under HS code 2810.00. This heading is specifically reserved for oxides of boron and boric acids. In the hierarchy of the Harmonized System, Chapter 28 deals with inorganic chemicals, and heading 2810 is a unique category that groups boron oxides and various forms of boric acid together at the six-digit level. Boron oxide is a critical raw material in the production of glass, ceramics, and enamels, where it acts as a fluxing agent to lower melting temperatures. The classification is straightforward because the heading text explicitly names the substance. It covers the oxide in its anhydrous form, typically appearing as a glassy solid or white powder. The classification remains consistent regardless of the purity level, provided the product is not a mixture or a prepared compound that would move it to a different chapter.
- Covers
- Diboron trioxide (B2O3)
- Boric anhydride
- Vitreous boron oxide
- Orthoboric acid
- Metaboric acid
- Also under 2810.00
- Etibank Boric Acid
- US Borax Boric Acid
- Borax Morarji Boric Acid
- Sigma-Aldrich Boric Acid
- Merck KGaA Boric Acid
Codes often confused with 2810.00
Common mistake. Boron oxide is often confused with borates, such as disodium tetraborate (borax), which are classified under heading 2840. While they both contain boron, borates are salts of boric acid, whereas 2810.00 is strictly for the oxides and the acids themselves. Another misclassification occurs with natural crude borates, which belong in Chapter 25 under HS code 2528.00. Importers must distinguish between the chemically pure oxide (2810.00) and the naturally occurring mineral ores.
Top exporters and importers of HS 281000 (the code used for boron oxide), 2025
In 2025, the largest exporter of HS 281000 (the code used for boron oxide) in UN Comtrade data was the United States, with 42% of world exports; the largest importer in UN Comtrade data was China, with 38% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 281000, not only boron oxide.
Top exporters 2025 · share of world exports
- 1 United States $212M 42% of world exports
- 2 Chile $85M 17% of world exports
- 3 Russia* ~$60M 12% of world exports · partner records ↗
World total: $502M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 China $283M 38% of world imports
- 2 Brazil $72M 9.7% of world imports
- 3 United States $45M 6.0% of world imports
World total: $747M 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 marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. 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 boron oxide
Brazil splits HS 2810.00 into 2 NCM codes. Pick the one that matches your product:
- 2810.00.10Orthoboric acid
- 2810.00.90Boron oxides and other boric acids
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about boron oxide
What is the HS code for Boron oxide?
The HS code for Boron oxide is 281000 (Oxides of boron; boric acids). The HS code for boron oxide is 2810.00, which also includes boric acids.
How do I classify Boron oxide for customs?
Boron oxide is classified under HS code 281000 — Oxides of boron; boric acids. This is a 6-digit subheading level code.
Does this code include borax?
No, borax is a borate and is classified under HS code 2840.11 or 2840.19, depending on its hydration state.
Which countries are the top exporters of boron oxide (HS 281000)?
In 2025, the top exporters of HS 281000 (the code used for boron oxide) in UN Comtrade data were the United States ($212M, 42% of world exports), Chile ($85M) and Russia (about $60M). World exports came to about $502M, 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 boron oxide (HS 281000)?
In 2025, the top importers of HS 281000 (the code used for boron oxide) in UN Comtrade data were China ($283M, 38% of world imports), Brazil ($72M) and the United States ($45M). World imports came to about $747M, 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.
Is the HS code for Boron oxide the same in all countries?
The base HS code 281000 for Boron oxide is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for boron oxide in Brazil?
Brazil splits HS 281000 into 2 NCM codes, so the right one for boron oxide depends on the product's details: 2810.00.10 (Orthoboric acid), 2810.00.90 (Boron oxides and other boric acids).