Product classification
HS code for Chromium trioxide: 2819.10
Chromium trioxide.
Classification of chromium trioxide under HS 2819.10
Chromium trioxide is classified under HS code 2819.10. This substance, often referred to in the industry as chromic acid or chromic anhydride, is an inorganic compound with the formula CrO3. It is classified within Chapter 28 (Inorganic chemicals) and Heading 2819 (Chromium oxides and hydroxides). The Harmonized System provides a specific primary subheading (2819.10) for this compound due to its high commercial importance and distinct chemical properties compared to other chromium oxides. It is a powerful oxidizer and is primarily used in chromium plating, wood preservation, and as an analytical reagent. The classification is straightforward under GRI 1, as the text of subheading 2819.10 explicitly names "Chromium trioxide." It must be a separate chemically defined compound to remain in this heading; if it were dissolved in water and prepared for a specific retail use, it might still fall here, but mixtures with other active ingredients would require a different classification.
- Covers
- Chromic anhydride
- Chromic acid flakes (solid CrO3)
- Chromium (VI) oxide
- Purified chromium trioxide crystals
- Also under 2819.10
- MacDermid Enthone Chromic Acid
- Atotech Chromic Acid
- Sigma-Aldrich Chromium Trioxide
Codes often confused with 2819.10
Common mistake. The most frequent misclassification is with HS code 2819.90, which covers "other" chromium oxides like chromium sesquioxide. Because chromium trioxide is often called "chromic acid," some importers look for it under 2811 (Other inorganic acids), but Chapter 28 Note 1 and the specific mention in 2819 override this. Another error involves 3817 or 3824 for plating solutions; if the product is pure chromium trioxide, it stays in 2819.10, but if it is a complex mixture for electroplating, it may move to Chapter 38.
Top exporters and importers of HS 281910 (the code used for chromium trioxide), 2025
In 2025, the largest exporter of HS 281910 (the code used for chromium trioxide) in UN Comtrade data was Kazakhstan, with 22% of world exports; the largest importer in UN Comtrade data was Brazil, with 14% 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 281910, not only chromium trioxide.
Top exporters 2025 · share of world exports
- 1 Kazakhstan $22M 22% of world exports
- 2 South Africa $18M 18% of world exports
- 3 India $17M 17% of world exports
World total: $99M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Brazil $23M 14% of world imports
- 2 Estonia $20M 12% of world imports
- 3 South Korea $12M 7.3% of world imports
World total: $165M 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 code for chromium trioxide
Brazil classifies chromium trioxide under NCM 2819.10.00: HS 2819.10 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about chromium trioxide
What is the HS code for Chromium trioxide?
The HS code for Chromium trioxide is 281910 (Chromium trioxide). The HS code for chromium trioxide is 2819.10.
How do I classify Chromium trioxide for customs?
Chromium trioxide is classified under HS code 281910 — Chromium trioxide. This is a 6-digit subheading level code.
Is chromic acid the same as chromium trioxide for HS purposes?
Yes, the commercial product known as chromic acid is chemically chromium trioxide and is classified under 2819.10.
Which countries are the top exporters of chromium trioxide (HS 281910)?
In 2025, the top exporters of HS 281910 (the code used for chromium trioxide) in UN Comtrade data were Kazakhstan ($22M, 22% of world exports), South Africa ($18M) and India ($17M). World exports came to about $99M, 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 chromium trioxide (HS 281910)?
In 2025, the top importers of HS 281910 (the code used for chromium trioxide) in UN Comtrade data were Brazil ($23M, 14% of world imports), Estonia ($20M) and South Korea ($12M). World imports came to about $165M, 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 Chromium trioxide the same in all countries?
The base HS code 281910 for Chromium trioxide 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 chromium trioxide in Brazil?
In Brazil, chromium trioxide (HS 281910) is classified under NCM 2819.10.00.