HS Code for Chromium trioxide

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.

Products Included

• Chromic anhydride
• Chromic acid flakes (solid CrO3)
• Chromium (VI) oxide
• Purified chromium trioxide crystals

Common Misclassification

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.

FAQ

What is the HS code for chromium trioxide?

The HS code for chromium trioxide is 2819.10.

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.