7405.00.10.00 - Containing by weight 5 percent or more but not more than 15 percent of phosphorus

This HTS category, 7405.00.10.00, specifically classifies master alloys of copper that contain by weight a precise proportion of phosphorus, falling within the range of 5 percent to 15 percent inclusive. These alloys are characterized by the addition of phosphorus to copper to modify its properties, such as improving its casting characteristics or acting as a deoxidizer.

It is crucial to distinguish this classification from its sibling, 7405.00.60, which covers "Other" master alloys of copper. The defining criterion for 7405.00.10.00 is the specific phosphorus content. Therefore, any master alloy of copper with a phosphorus content outside this 5-15% range, or master alloys of copper with other alloying elements where phosphorus is not the primary defining characteristic in this specified range, would be classified under the sibling "Other" category.

As a leaf node, this classification does not have further subcategories. The precise phosphorus content is the sole determinant for classifying goods under this specific HTS code. Therefore, when classifying, it is essential to verify the exact weight percentage of phosphorus present in the master alloy of copper to ensure correct entry.