2809.20.00.10 - Containing less than 65 percent available diphosphorus pentaoxide (P2O5) equivalents

This HTS classification covers phosphoric acid and polyphosphoric acids that are specifically designated for use as fertilizer. The key defining characteristic for inclusion in this subcategory is that the material contains less than 65 percent available diphosphorus pentaoxide (P2O5) equivalents. This threshold is crucial for distinguishing between different grades and applications of phosphoric acid.

This category is differentiated from its sibling, 2809.20.00.20 "Other," by its defined P2O5 content and intended application. While the "Other" category would encompass phosphoric acid not meeting the fertilizer grade criteria or intended for different industrial or chemical uses, this specific code is reserved solely for fertilizer-grade products meeting the specified P2O5 concentration.

As a leaf node, this classification does not have further subcategories. The precise P2O5 content below 65 percent, coupled with its intended use in agricultural fertilizers, is the sole determining factor for classification under 2809.20.00.10. Importers and exporters should ensure that documentation accurately reflects both the chemical composition and the intended end-use to facilitate correct customs clearance.