Product classification
HS code for Chromic acid: 2819.10
Chromium trioxide.
Classification of chromic acid under HS 2819.10
Chromic acid, chemically known as chromium trioxide, is classified under HS code 2819.10. Chapter 28 covers inorganic chemicals and precious metal compounds. Heading 2819 is designated for chromium oxides and hydroxides. Within this heading, 2819.10 specifically identifies chromium trioxide. Although often referred to commercially as \"chromic acid,\" especially when in aqueous solution or flake form for electroplating, the Harmonized System classifies it based on its chemical structure as an oxide. The classification is precise because 2819.10 is a specific subheading for the trioxide (CrO3), which is the anhydride of true chromic acid (H2CrO4). This code is used for technical, industrial, and reagent grades of the chemical.
- Covers
- Chromium trioxide flakes
- Chromic anhydride
- Chromic acid flakes (Technical grade)
- Aqueous solutions of chromium trioxide
- Chromium (VI) oxide
- Also under 2819.10
- MacDermid Enthone Chromic Acid
- Atotech Chromic Acid
- Sigma-Aldrich Chromium Trioxide
Codes often confused with 2819.10
Common mistake. Chromic acid is often misclassified under 2824, which covers lead oxides, or 2833.29, which covers other sulfates including chromium sulfates (often used in tanning). Another common error is 3817, which involves mixed alkylbenzenes, or 3824, for prepared binders for foundry molds. Because \"chromic acid\" is a term used for various mixtures in the plating industry, users sometimes try to classify it as a prepared chemical mixture under 3824, but if the product is essentially chromium trioxide, 2819.10 is the legally required code.
Top exporters and importers of HS 281910 (the code used for chromic acid), 2025
In 2025, the largest exporter of HS 281910 (the code used for chromic acid) 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 chromic acid.
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 chromic acid
Brazil classifies chromic acid 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 chromic acid
What is the HS code for Chromic acid?
The HS code for Chromic acid is 281910 (Chromium trioxide). The HS code for chromic acid (chromium trioxide) is 2819.10.
How do I classify Chromic acid for customs?
Chromic acid is classified under HS code 281910 — Chromium trioxide. This is a 6-digit subheading level code.
Is liquid chromic acid classified differently than flakes?
No, both the solid flake form and the aqueous solution of chromium trioxide are typically classified under 2819.10, as the solution is simply the chemical dissolved in water without other additives.
Which countries are the top exporters of chromic acid (HS 281910)?
In 2025, the top exporters of HS 281910 (the code used for chromic acid) 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 chromic acid (HS 281910)?
In 2025, the top importers of HS 281910 (the code used for chromic acid) 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 Chromic acid the same in all countries?
The base HS code 281910 for Chromic acid 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 chromic acid in Brazil?
In Brazil, chromic acid (HS 281910) is classified under NCM 2819.10.00.