HS Code for Chlorosulfuric acid

Chlorosulfuric acid is classified under HS code 2806.20 according to the General Rules for the Interpretation of the Harmonized System (GRI). Specifically, GRI 1 dictates that classification is determined by the terms of the headings and any relative section or chapter notes. Chapter 28 covers inorganic chemicals, and heading 2806 is specifically designated for hydrogen chloride (hydrochloric acid) and chlorosulphuric acid. As a distinct chemical compound, chlorosulfuric acid (HSO3Cl) fits precisely into this subheading. The classification process involves identifying the chemical structure as an inorganic acid where a hydroxyl group of sulfuric acid is replaced by chlorine. This specific chemical identity precludes it from being classified under more general headings for other inorganic acids or sulfur-based compounds. Furthermore, the Harmonized System Explanatory Notes for heading 2806 clarify that chlorosulphuric acid, often commercially referred to as chlorosulphonic acid, is a colorless or yellowish liquid that fumes in moist air and is used primarily in organic synthesis, particularly for sulfonations. Because it is a well-defined chemical entity, it must be classified in Chapter 28 rather than as a preparation in later chapters, provided it meets the purity requirements set forth in Note 1 to Chapter 28. The classification remains consistent regardless of the concentration, provided it is not mixed with other substances that would change its character as a separate chemically defined compound.

Products Included

• Chlorosulphuric acid
• Chlorosulphonic acid
• Sulfuric chlorohydrin
• Monochlorosulphuric acid

Common Misclassification

Chlorosulfuric acid is frequently misclassified under HS code 2807.00, which is reserved for sulphuric acid and oleum. While chemically related, the presence of the chlorine atom necessitates classification under 2806.20. It is also sometimes confused with 2811.19, which covers other inorganic acids, but since chlorosulfuric acid is specifically named in heading 2806, that heading takes precedence over the residual category.

FAQ

What is the HS code for chlorosulfuric acid?

The international HS code for chlorosulfuric acid is 2806.20.

Is chlorosulfuric acid classified differently if it is used as a reagent?

No, as long as it remains a separate chemically defined compound, its intended use as a laboratory reagent does not change its classification under 2806.20.