3103.11.00.00 - Containing by weight 35 percent or more of diphosphorous pentaoxide (P2O5)

This HTS classification covers phosphatic fertilizers, specifically superphosphates, that contain a significant concentration of diphosphorous pentaoxide (P2O5). The defining characteristic for this category is the presence of 35 percent or more of P2O5 by weight. These products are primarily used as sources of phosphorus for plant nutrition, playing a vital role in agricultural applications.

The distinction between this category and its sibling, 3103.19.00.00, lies solely in the phosphorus content. While both fall under superphosphates, this specific heading is reserved for those formulations meeting the high threshold of 35% P2O5. Products not meeting this minimum percentage, or those with a different chemical composition within the superphosphate family, would be classified under the "Other" category.

As a leaf node in the HTS, this classification does not have further subcategories. Therefore, classification into this heading is definitive once the product is identified as a superphosphate and its diphosphorous pentaoxide content is confirmed to be 35 percent or more by weight. Practical classification relies on laboratory analysis of the product's chemical composition.