HS Code for Oleum

Oleum, also known as fuming sulfuric acid, is classified under HS code 2807.00. This heading specifically covers sulfuric acid and oleum. Oleum is produced by dissolving sulfur trioxide (SO3) in concentrated sulfuric acid (H2SO4). In the nomenclature of the Harmonized System, inorganic chemicals are classified in Chapter 28. Since oleum is a direct derivative and chemical relative of sulfuric acid, it is grouped within the same four-digit heading. The classification is straightforward because the heading text explicitly names "oleum." It is a heavy, oily, and highly corrosive liquid used extensively in chemical synthesis, particularly in nitration processes and the manufacture of dyes and explosives. The purity and concentration of the sulfur trioxide do not change the heading, provided it remains an inorganic acid solution. The classification remains consistent regardless of the concentration of free SO3, which typically ranges from 20% to 65% in commercial grades. Because it is a well-defined chemical compound/solution, it does not fall into the residual categories of Chapter 38, provided it is not mixed with other functional chemicals that would change its primary use as an acid.

Products Included

• Fuming sulfuric acid
• Pyrosulfuric acid
• Sulfur trioxide in sulfuric acid solution
• Commercial grade oleum (20%, 65% SO3)
• Technical grade fuming acid

Common Misclassification

Oleum is sometimes misclassified under HS code 2811.19, which covers other inorganic acids. However, because heading 2807 specifically names sulfuric acid and oleum, the specific heading takes precedence over the general one. It may also be confused with HS code 3824.99 for chemical mixtures, but as a defined inorganic acid solution, Chapter 28 is the correct legal placement under the GRI.

FAQ

What is the HS code for Oleum?

The HS code for Oleum is 2807.00, which is the same code used for standard sulfuric acid.

Is oleum classified differently based on its concentration?

No, all concentrations of sulfur trioxide dissolved in sulfuric acid are classified under 2807.00, as long as the solution remains primarily an inorganic acid.