7409.39.10.30 - Of phosphor bronze

This HTS category, 7409.39.10.30, specifically covers plates, sheets, and strip of copper-tin base alloys (bronze) that are of a thickness of 5 mm or more and are composed of phosphor bronze. Phosphor bronze is characterized by the addition of phosphorus to a copper-tin alloy, which enhances its mechanical properties such as strength, hardness, and corrosion resistance. These items are a subset of wider bronze products within the copper-tin base alloy category, distinguished by their specific alloy composition.

The primary distinction of this category lies in its precise material definition: "Of phosphor bronze." This differentiates it from other copper-tin base alloys that may not contain phosphorus or contain it in significantly different proportions, thus falling under the "Other" sibling category at the same level (7409.39.10.60). Both this category and its sibling share the common attributes of being copper-tin base alloys in plate, sheet, or strip form, exceeding 0.15 mm in thickness, and meeting the 5 mm or greater thickness requirement.

As this classification represents a leaf node in the HTS, there are no further subcategories. Therefore, the classification is complete once the material is identified as phosphor bronze and the thickness requirement of 5 mm or more is met. Practical classification relies on verifying the alloy composition through certificates of analysis or material testing to confirm the presence and proportion of phosphorus within the copper-tin base alloy.