HS Code for Sodium thiosulphate

Sodium thiosulphate is classified under HS code 2832.30, which specifically covers thiosulphates. This classification is governed by the Harmonized System's structure for inorganic chemicals in Chapter 28. Specifically, heading 2832 is designated for sulphites, thiosulphates, and their salts. Sodium thiosulphate, with the chemical formula Na2S2O3, is an inorganic salt that fits the criteria of this heading perfectly. The classification follows General Rule of Interpretation (GRI) 1, which states that classification is determined by the terms of the headings and any relative section or chapter notes. Since 2832.30 explicitly names \"Thiosulphates,\" there is no ambiguity for pure sodium thiosulphate. The product is typically traded in crystalline or anhydrous forms. Its classification remains consistent regardless of whether it is intended for industrial water treatment, gold ore processing, or as a photographic fixer. The purity of the substance must be considered; however, as long as it is a separate chemically defined compound, it remains in Chapter 28. If the product were mixed with other substances to form a prepared chemical for photographic use, it might move to Chapter 37, but the raw chemical salt is strictly 2832.30.

Products Included

• Sodium thiosulphate pentahydrate
• Anhydrous sodium thiosulphate
• Technical grade sodium thiosulphate
• Photographic grade sodium thiosulphate (pure)
• Pharmaceutical grade sodium thiosulphate

Common Misclassification

A common point of confusion arises between sodium thiosulphate (2832.30) and sodium sulphites (2832.10) or sodium metabisulphite (2832.20). While they are all salts of sulphur-based oxoacids, their chemical structures and applications differ significantly. Sodium sulphite (Na2SO3) is used primarily in the pulp and paper industry, whereas sodium thiosulphate is used in photography and mining. Another frequent misclassification occurs with photographic chemical preparations. If sodium thiosulphate is packaged for retail sale as a photographic fixer and contains other ingredients like hardeners or buffers, it must be classified under HS code 3707.90. Importers often mistakenly use the chemical code 2832.30 for these prepared mixtures, which can lead to customs delays and incorrect duty payments. Additionally, sodium thiosulphate should not be confused with sodium sulphate (2833.11), which is a salt of sulphuric acid, not thiosulphuric acid.

FAQ

What is the HS code for sodium thiosulphate?

The standard international HS code for sodium thiosulphate is 2832.30, which falls under the category of thiosulphates.

Is sodium thiosulphate classified differently if it is in liquid form?

No, as long as it is a pure aqueous solution of the chemically defined compound, it remains under HS code 2832.30. However, if it contains other chemical additives, it may be classified elsewhere.