HS Code for Phosphorus pentoxide

Phosphorus pentoxide, scientifically referred to as diphosphorus pentoxide (P4O10), is classified under HS code 2809.10. This code is found within heading 2809, which specifically includes diphosphorus pentaoxide, phosphoric acid, and polyphosphoric acids. Phosphorus pentoxide is a powerful desiccant and dehydrating agent, appearing as a white crystalline powder. Its classification is straightforward because heading 2809 is a "named" heading for this specific oxide. In the hierarchy of the Harmonized System, a specific named heading takes precedence over more general headings like 2811 (other inorganic acids and other inorganic oxygen compounds of non-metals). The classification reflects its role as the anhydride of phosphoric acid, meaning it forms phosphoric acid when reacted with water. This chemical is vital in the synthesis of organic esters and in various laboratory drying applications where moisture removal is critical.

Products Included

• Diphosphorus pentoxide
• Phosphoric anhydride
• Phosphorus(V) oxide
• P2O5 (empirical formula)

Common Misclassification

Phosphorus pentoxide is sometimes confused with other phosphorus oxides that fall under HS code 2811.29, such as phosphorus trioxide. However, because 2809.10 specifically names diphosphorus pentoxide, it must be used. It is also frequently confused with phosphoric acid (HS code 2809.20). While they are in the same heading, the pentoxide is the solid anhydride, whereas the acid is the hydrated form. Another error involves confusing it with phosphate salts, such as sodium triphosphate (HS code 2835.31), which are inorganic salts rather than pure oxides. Ensuring the product is identified as the oxide rather than a salt or acid is key to correct tariff application and regulatory compliance.

FAQ

What is the HS code for Phosphorus pentoxide?

The HS code for phosphorus pentoxide is 2809.10.

Is phosphorus pentoxide the same as phosphoric acid?

No, phosphorus pentoxide (2809.10) is the anhydride that reacts with water to form phosphoric acid (2809.20).