7409.90.90.30 - Of beryllium copper

This classification covers copper plates, sheets, and strip specifically made of beryllium copper alloys. The material must be of a thickness exceeding 0.15 mm, and fall under the broader category of "other copper alloys" not otherwise specified. Within this broader group, these items are further refined by being less than 5 mm in thickness and less than 500 mm in width. Beryllium copper is a high-performance alloy known for its excellent strength, conductivity, and corrosion resistance, making it suitable for specialized applications.

This specific HTS code is distinguished from its sibling category, 7409.90.90.60 ("Other"), by its precise material composition. While the "Other" category would encompass other unspecified copper alloys, this node is exclusively for products made from beryllium copper. Therefore, the key differentiator is the presence of beryllium as a significant alloying element within the copper.

As this is a leaf node in the HTS structure, there are no further subcategories. Classification under this code is determined by meeting all the preceding criteria: the material being a copper plate, sheet, or strip exceeding 0.15 mm in thickness, being an alloy not otherwise specified, having a thickness less than 5 mm, a width less than 500 mm, and crucially, being composed of beryllium copper.