HS Code for Sodium hypophosphite

Sodium hypophosphite, also known as sodium phosphinate (NaPO2H2), is classified under HS code 2835.10. This heading covers phosphinates (hypophosphites) and phosphonates (phosphites). The classification is driven by the oxidation state of the phosphorus atom. In the Harmonized System, inorganic salts of oxoacids of phosphorus are grouped together under heading 2835, but they are distinguished by their chemical structure. Hypophosphites contain phosphorus in the +1 oxidation state, which differentiates them from phosphates where phosphorus is in the +5 state. This chemical distinction is critical for customs purposes and regulatory compliance. Sodium hypophosphite is a critical industrial chemical, primarily used as a reducing agent in the electroless nickel plating process. This process allows for uniform metal coating on various substrates, including plastics and complex geometries. It also finds use as a catalyst in some polymerization reactions, a stabilizer for plastics, and an intermediate in pharmaceutical manufacturing. For classification purposes, the product must be a separate chemically defined compound as per Note 1 to Chapter 28. If the product is a mixture or a prepared solution with other active ingredients for plating, it might be classified under Heading 3824 as a chemical preparation. However, the pure salt, even if containing minor impurities from the manufacturing process, remains under 2835.10. The classification remains consistent regardless of whether the product is in its anhydrous form or as a monohydrate, as both are considered chemically defined inorganic salts within the scope of Chapter 28.

Products Included

• Sodium hypophosphite monohydrate
• Anhydrous sodium hypophosphite
• Crystalline sodium phosphinate
• Electroless nickel plating grade sodium hypophosphite
• Pharmaceutical grade sodium hypophosphite

Common Misclassification

Sodium hypophosphite is frequently confused with 2835.29, which covers other phosphates, or 2835.31, which is specific to sodium triphosphate. The confusion arises from the similarity in names, but the chemical oxidation state of phosphorus is the deciding factor. It may also be misclassified under 3824.99 if it is part of a proprietary plating solution blend.

FAQ

What is the HS code for Sodium hypophosphite?

The HS code for sodium hypophosphite is 2835.10, covering phosphinates and phosphonates.

Can sodium hypophosphite be classified as a fertilizer?

No, sodium hypophosphite does not contain the necessary nitrogen, phosphorus (in phosphate form), or potassium levels required for Chapter 31 fertilizer classification.